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35 results on '"CSNSM PCI"'

1. Damage accumulation in MgO irradiated with MeV Au ions at elevated temperatures

Author: Lionel Thomé, Diana Bachiller-Perea, Moni Behar, Aurélien Debelle, Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM PCI), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Univ. Paris-Sud
Subjects: Diffraction, Nuclear and High Energy Physics, Materials science, MIGRATION, Annealing (metallurgy), Analytical chemistry, Oxide, MgO, 02 engineering and technology, 01 natural sciences, Fluence, Ion, chemistry.chemical_compound, 0103 physical sciences, General Materials Science, Cubic zirconia, Irradiation, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], 010306 general physics, [PHYS]Physics [physics], ZIRCONIA, Irradiation damage, Radiochemistry, OXIDE, 021001 nanoscience & nanotechnology, Reciprocal lattice, Nuclear Energy and Engineering, chemistry, Ion irradiation, 0210 nano-technology, RBS/C
Abstract: International audience; The damage accumulation process in MgO single crystals under medium-energy heavy ion irradiation (1.2 MeV Au) at fluences up to 4 x 1014 cm(-2) has been studied at three different temperatures: 573, 773, and 1073 K. Disorder depth profiles have been determined through the use of the Rutherford back-scattering spectrometry in channeling configuration (RBS/C). The analysis of the RBS/C data reveals two steps in the MgO damage process, irrespective of the temperature. However, we find that for increasing irradiation temperature, the damage level decreases and the fluence at which the second step takes place increases. A shift of the damage peak at increasing fluence is observed for the three temperatures, although the position of the peak depends on the temperature. These results can be explained by an enhanced defect mobility which facilitates defect migration and may favor defect annealing. X-ray diffraction reciprocal space maps confirm the results obtained with the RBS/C technique. (C) 2016 Elsevier B.V. All rights reserved.
Published: 2016
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2. Multi-scale simulation of the experimental response of ion-irradiated zirconium carbide: Role of interstitial clustering

Author: Aurélien Debelle, Lionel Thomé, S. Pellegrino, Patrick Trocellier, Thomas Jourdan, Jean-Paul Crocombette, Service de recherches de métallurgie physique (SRMP), Département des Matériaux pour le Nucléaire (DMN), CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, CSNSM PCI, Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Materials science, Polymers and Plastics, Ion beam, 02 engineering and technology, 01 natural sciences, Molecular physics, Fluence, Ion, Zirconium carbide, Interstitial clusters, chemistry.chemical_compound, 0103 physical sciences, Irradiation, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], Diffusion (business), [PHYS]Physics [physics], 010302 applied physics, Metals and Alloys, Rate equation, 021001 nanoscience & nanotechnology, Rate equation cluster dynamics, Electronic, Optical and Magnetic Materials, Crystallography, chemistry, Ion irradiation, Transmission electron microscopy, Ceramics and Composites, 0210 nano-technology
Abstract: International audience; The response of zirconium carbide to heavy-ion irradiation at room temperature has been studied by X-ray diffraction, ion channeling and transmission electron microscopy. Below 5 × 1014 cm−2, we observe a build-up of elastic strain with increasing fluences. At this threshold fluence the strain is released and important dechanneling appears as well as visible TEM damage. With increasing fluence, this damage is found to spread in the material deeper than the depth of direct damaging by the ion beam. These experimental observations are reproduced and explained by Density Functional Theory informed Rate Equation Cluster Dynamics simulations. Simulations show that the response of ZrC upon ion-irradiation is driven by the diffusion and clustering of interstitials. The two-step evolution seen in experiments stems from the growth of interstitial clusters with a concomitant starvation of the smallest clusters induced by the continuous accumulation of vacancies. The damaging of the material beyond the range of primary damage is driven by diffusion of interstitials.
Published: 2016
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3. Damage processes in MgO irradiated with medium-energy heavy ions

Author: Aurélien Debelle, Sandra Moll, William J. Weber, Jacek Jagielski, Lionel Thomé, Yanwen Zhang, Jean-Paul Crocombette, Z. Zihua, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Department of Mechanical and Aerospace Engineering [Princeton] (MAE), Princeton University, CSNSM PCI, Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Institute of Electronic Materials Technology (IEMT), Institute of Electronic Materials Technology, Pacific Northwest National Laboratory (PNNL), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)
Subjects: Materials science, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], Polymers and Plastics, Metals and Alloys, Analytical chemistry, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Rutherford backscattering spectrometry, Electronic, Optical and Magnetic Materials, Ion, Secondary ion mass spectrometry, Transmission electron microscopy, Nuclear reaction analysis, Ceramics and Composites, Cubic zirconia, Irradiation, Atomic physics, medium-energy, Yttria-stabilized zirconia
Abstract: International audience; The micro-structural modifications produced in MgO single crystals exposed to medium-energy heavy ions (1.2-MeV Au) were investigated using Rutherford backscattering spectrometry in channeling geometry coupled to Monte-Carlo analyses, secondary ion mass spectrometry, X-ray diffraction and transmission electron microscopy. The damage accumulation and the elastic strain variation were interpreted in the framework of the multi-step damage accumulation (MSDA) model. Both build-ups follow a multi-step process similar to that recently observed for ion-irradiated yttria-stabilized zirconia (YSZ) single crystals. However, in MgO, an unexpectedly high disorder level occurs far beyond the theoretical damage distribution. These results strongly suggest that the migration of defects created in the near-surface layer is most likely at the origin of the broadening of the damage depth distribution in MgO.
Published: 2015
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4. Annealing Effect on the Structural and Magnetic Properties of Mn-Implanted 6H-SiC

Author: Alain Declémy, Khalid Bouziane, Maya Al Azri, Lionel Thomé, M. E. Elzain, Michel Viret, Salim M. Chérif, CSNSM PCI, Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Service de physique de l'état condensé (SPEC - UMR3680), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)
Subjects: [PHYS]Physics [physics], 010302 applied physics, silicon carbide (SiC), Electron probe microanalysis, Materials science, Annealing (metallurgy), Analytical chemistry, diluted magnetic semiconductors (DMSs), 02 engineering and technology, 021001 nanoscience & nanotechnology, 01 natural sciences, Fluence, Spectral line, Electronic, Optical and Magnetic Materials, Dilution, Magnetization, 0103 physical sciences, Annealing effect, implantation, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], Electrical and Electronic Engineering, 0210 nano-technology, Spectroscopy
Abstract: International audience; n-type 6H-SiC(0001) substrates were implanted with a fluence of Mn+ 5x 10(16) (maximum Mn content of 7%), with implantation energy of 80 keV and substrate temperature of 365 degrees C to promote recrystallization. The samples were characterized using Rutherford backscattering and channeling (RBS/C) spectroscopy and electron probe microanalysis in the energy dispersive X-ray (EPMA-EDX) technique; while the magnetization was studied using a superconducting quantum interference device techniques. In the as-implanted sample, three well-defined specific defect zones were identified as deduced from the analysis of RBS/C spectra. It is shown that the two main vacancy-related and interstitial-related defects undergo limited changes when annealing at 800 degrees C, while a major recovery is obtained after annealing at 1100 degrees C. Strain relaxation was also observed upon annealing as determined from HRXRD. Magnetization was strongly reduced with increasing annealing temperature from 800 degrees C to 1600 degrees C. This effect seems to be related to the dilution effect (reduction of Mn content) due to the local diffusion of Mn as suggested from the results obtained using both RBS/C and EPMA-EDX techniques.
Published: 2014
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5. Effects of thermal annealing on the evolution of He bubbles in zirconia

Author: Sha Yan, Tengfei Yang, Chenxu Wang, Gihan Velisa, A. Debelle, Yugang Wang, Shuyan Kong, Lionel Thomé, Jianming Xue, CSNSM PCI, Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Nuclear and High Energy Physics, Materials science, Irradiation stability, Thermal annealing, Annealing (metallurgy), Economies of agglomeration, Bubble, He bubbles, Fluence, Ion, Crystal, Crystallography, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Defects, Cubic zirconia, Liquid bubble, Composite material, Instrumentation
Abstract: Single crystals of yttria-stabilized zirconia were implanted with 100 keV He ions at two fluences of 9 × 1016 and 3 × 1017 cm−2 (5 and 17 He at.%). In order to investigate the effect of thermal annealing on the evolution of both zirconia lattice and implanted He, the samples were annealed at several temperatures ranging from 500 °C to 1400 °C. Three complementary analysis techniques, RBS/C, AFM and TEM were used to study structural damage and surface morphology of the crystal before and after implantation. Results show different He evolution phenomena under the two implantation fluences. It is inferred that, at the lower fluence, the migration and agglomeration of He ions lead to bubble formation after annealing. These bubbles jack up sample surface causing the deformation of surface region and the damage level of surface region increase accordingly. As the temperature continues to increase, He gradually releases and the damage recovers. However, at the higher fluence, the He concentration is sufficient to induce bubble precipitation without annealing. He release and damage recovering is less efficient upon annealing. 2014 Elsevier B.V. All rights reserved
Published: 2014
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6. Experimental approach and atomistic simulations to investigate the radiation tolerance of complex oxides: Application to the amorphization of pyrochlores

Author: Clara Grygiel, C. Legros, Gaël Sattonnay, Lionel Thomé, Isabelle Monnet, R. Tetot, N. Sellami, Institut de Chimie Moléculaire et des Matériaux d'Orsay (ICMMO), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC), CSNSM PCI, Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252), Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Caen Normandie (UNICAEN), Normandie Université (NU), Université Paris-Sud - Paris 11 (UP11)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), and Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Nuclear and High Energy Physics, Materials science, Scattering, Coordination number, Pyrochlore, engineering.material, Charged particle, Ion, Crystallography, Ion irradiation Pyrochlores X-ray diffraction Atomistic simulation, Chemical physics, X-ray crystallography, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], engineering, Irradiation, Instrumentation, Radiation resistance
Abstract: Both experimental approach and atomistic simulations are performed in order to investigate the influence of the composition of pyrochlores on their radiation tolerance. Therefore, Gd2Ti2O7 and Gd2Zr2O7 were irradiated with 4 MeV Au and 92 MeV Xe ions in order to study the structural changes induced by low and high-energy irradiations. XRD results show that, for both irradiations, the structural modifications are strongly dependent on the sample composition: Gd2Ti2O7 is readily amorphized, whereas Gd2Zr2O7 is transformed into a radiation-resistant anion-deficient fluorite structure. Using atomistic simulations with new interatomic potentials derived from the SMTB-Q model, the lattice properties and the defect formation energies were calculated in Gd2Ti2O7 and Gd2Zr2O7. Calculations show that titanates have a more covalent character than zirconates. Moreover, in Gd2Ti2O7 the formation of cation antisite defects leads to strong local distortions around Ti-defects and to a decrease of the Ti coordination number, which are not observed in Gd2Zr2O7. Thus, the radiation resistance is related to the defect stability: the accumulation of structural distortions around Ti-defects could drive the Gd2Ti2O7 amorphization induced by irradiation. 2014 Elsevier B.V. All rights reserved
Published: 2014
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7. Structural stability of Nd2Zr2O7 pyrochlore ion-irradiated in a broad energy range

Author: Clara Grygiel, Lionel Thomé, N. Sellami, Jacek Jagielski, I. Jozwik-Biala, Gaël Sattonnay, Isabelle Monnet, C. Legros, Patrick Simon, Institut de Chimie Moléculaire et des Matériaux d'Orsay (ICMMO), Université Paris-Sud - Paris 11 (UP11)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), CSNSM PCI, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), The Andrzej Soltan Institute for Nuclear Studies, Institute of Electronic Materials Technology (IEMT), Institute of Electronic Materials Technology, Conditions Extrêmes et Matériaux : Haute Température et Irradiation (CEMHTI), Université d'Orléans (UO)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Caen Normandie (UNICAEN), Normandie Université (NU), and Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université d'Orléans (UO)
Subjects: Materials science, Polymers and Plastics, Annealing (metallurgy), Pyrochlore, 02 engineering and technology, engineering.material, 01 natural sciences, Pyrochlores, Ion, symbols.namesake, High-resolution transmission electron microscopy, 0103 physical sciences, 010302 applied physics, Ion track, Metals and Alloys, Recrystallization (metallurgy), 021001 nanoscience & nanotechnology, X-ray diffraction, Electronic, Optical and Magnetic Materials, Crystallography, Ion irradiation, Raman spectroscopy, X-ray crystallography, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Ceramics and Composites, symbols, engineering, 0210 nano-technology
Abstract: The phase transformations induced by electronic excitation ( S e ) and ballistic processes ( S n ) in Nd 2 Zr 2 O 7 pyrochlores irradiated with heavy ions in three domains of energy (∼1 GeV, ∼100 MeV and a few MeV) were investigated by X-ray diffraction, Raman spectroscopy and transmission electron microscopy. In the S e regime at high energy, results show that: (i) ion tracks are formed above a S e threshold of 12.5 keV nm −1 ; (ii) both pyrochlore → anion-deficient fluorite phase transition and amorphization occur; (iii) total amorphization is always observed at the highest fluences; (iv) the internal structure (amount of amorphous phase vs. its anion-deficient fluorite counterpart) and the diameter of tracks depend on many parameters such as S e , the deposited energy density and the recrystallization rate. For irradiations performed with low-energy ions in the S n regime, only the anion-deficient fluorite phase is formed up to a dose of 40 dpa. Thus Nd 2 Zr 2 O 7 exhibits an unusual behaviour since this compound is amorphizable by S e and non-amorphizable by S n . Annealing of totally amorphized Nd 2 Zr 2 O 7 samples reveals strong differences in the recovery processes with other pyrochlore materials that are related to their different chemical compositions.
Published: 2013
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8. Ion irradiation studies of silver/amorphous carbon nanocomposite thin film

Author: J.C. Pivin, D.K. Avasthi, Rahul Singhal, Ramesh Chandra, CSNSM PCI, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)
Subjects: Materials science, Physics::Instrumentation and Detectors, Physics::Medical Physics, Analytical chemistry, Physics::Optics, 02 engineering and technology, 7. Clean energy, 01 natural sciences, Ion, Condensed Matter::Materials Science, symbols.namesake, Swift heavy ion, Surface plasmon resonance, 0103 physical sciences, Materials Chemistry, Irradiation, Graphite, Nuclear Experiment, 010302 applied physics, Nanocomposite, Surfaces and Interfaces, General Chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Surfaces, Coatings and Films, Amorphous carbon, Ion irradiation, Transmission electron microscopy, Raman spectroscopy, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], symbols, Nanoparticles, 0210 nano-technology
Abstract: We study the optical and microstructural properties of silver/amorphous carbon (Ag/a-C) nanocomposite thin film and its modification induced by swift heavy ion irradiation. Ag nanoparticles (NPs) embedded in a-C matrix were synthesized by co-sputtering of Ag and graphite by 1.5 keV neutral Ar atom beam. These Ag NPs were irradiated by 120 MeV Ag ions at different fluences ranging from 1 × 10 12 to 3 × 10 13 ions/cm 2 . Optical absorption studies revealed that surface plasmon resonance of Ag NPs in pristine film occurs at a wavelength of ~ 430 nm and it shows a blue shift (~ 26 nm) with increasing ion fluence up to 3 × 10 13 ions/cm 2 . Transmission electron microscopy and Rutherford backscattering spectroscopy were used to quantify particle size and metal atomic fraction, respectively, in the nanocomposite films. The growth of Ag NPs with bi-model distribution at a fluence of 3 × 10 13 ions/cm 2 was observed with ion irradiation. Raman spectroscopy was used to investigate the effect of heavy ion irradiation on carbon matrix. The blue shift in plasmonic wavelength is explained in terms of increase in sp 2 content in carbon matrix by heavy ion irradiation due to thermal energy deposition which leads to a decrease in dielectric properties of the matrix.
Published: 2013
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9. Proton beam modification of lead white pigments

Author: F. Miserque, P.C. Gutiérrez, Lionel Thomé, Lucile Beck, Service de recherches de métallurgie physique (SRMP), Département des Matériaux pour le Nucléaire (DMN), CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Centre de recherche et de restauration des musées de France (C2RMF), Centre National de la Recherche Scientifique (CNRS)-Ministère de la Culture et de la Communication (MCC), Laboratoire d'Etude de la Corrosion Aqueuse (LECA), Service de la Corrosion et du Comportement des Matériaux dans leur Environnement (SCCME), Département de Physico-Chimie (DPC), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Département de Physico-Chimie (DPC), CSNSM PCI, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Ministère de la Culture et de la Communication (MCC)-Centre National de la Recherche Scientifique (CNRS), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Pigments, Nuclear and High Energy Physics, Materials science, Inorganic chemistry, Analytical chemistry, UV treatments, chemistry.chemical_element, Zinc, Thermal treatment, 01 natural sciences, Annealing, Painting, symbols.namesake, Pigment, chemistry.chemical_compound, X-ray photoelectron spectroscopy, Ion beam modification, 0103 physical sciences, Irradiation, Instrumentation, 010302 applied physics, Calcite, 010401 analytical chemistry, 0104 chemical sciences, Titanium oxide, chemistry, Ion irradiation, visual_art, Raman spectroscopy, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], symbols, visual_art.visual_art_medium, sense organs
Abstract: Pigments and paint materials are known to be sensitive to particle irradiation. Occasionally, the analysis of paintings by PIXE can induce a slight or dark stain depending on the experimental conditions (beam current, dose, particle energy). In order to understand this discoloration, we have irradiated various types of art white pigments – lead white (hydrocerussite and basic lead sulfate), gypsum, calcite, zinc oxide and titanium oxide – with an external 3 MeV proton micro-beam commonly used for PIXE experiments. We have observed various sensitivities depending on the pigment. No visible change occurs for calcite and titanium oxide, whereas lead white pigments are very sensitive. For the majority of the studied compounds, the discoloration is proportional to the beam current and charge. The damage induced by proton beam irradiation in lead white pigments was studied by micro-Raman and XPS spectroscopies. Structural modifications and dehydration were detected. Damage recovery was investigated by thermal treatment and UV-light irradiation. The discoloration disappeared after one week of UV illumination, showing that PIXE experiments could be safely undertaken for pigments and paintings.
Published: 2013
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10. Effect of combined local variations in elastic and inelastic energy losses on the morphology of tracks in ion-irradiated materials

Author: Aurélien Debelle, Stamatis Mylonas, Lionel Thomé, Bruce W. Arey, Gaël Sattonnay, Isabelle Monnet, I. Jozwik-Biala, Libor Kovarik, Jacek Jagielski, Institute of Electronic Materials Technology (IEMT), Institute of Electronic Materials Technology, Institut de Chimie Moléculaire et des Matériaux d'Orsay (ICMMO), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC), CSNSM PCI, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252), Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Caen Normandie (UNICAEN), Normandie Université (NU), Université Paris-Sud - Paris 11 (UP11)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), and Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Materials science, Polymers and Plastics, SOLIDS, Mineralogy, High resolution transmission electron microscopy, 02 engineering and technology, PRESSURE, 01 natural sciences, Molecular physics, Focused ion beam, Ion, Crystal, Tracks, 0103 physical sciences, Atom, SWIFT HEAVY-IONS, 010306 general physics, Envelope (waves), DAMAGE, Ion track, Metals and Alloys, Elastic energy, INORGANIC INSULATORS, 021001 nanoscience & nanotechnology, Electronic, Optical and Magnetic Materials, MODEL, Core (optical fiber), Ion irradiation, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Ceramics and Composites, Defects, 0210 nano-technology, PYROCHLORE
Abstract: Detailed analysis of the morphology of latent tracks created by swift heavy ions from the surface entry point on a pyrochlore crystal to the end of the ion trajectory reveals continuous changes in the track diameter as a function of ion deceleration, loss of track parallelism beyond a certain depth and the evolution from continuous to discontinuous tracks. The tracks exhibit a layered structure composed of a non-crystalline core surrounded by a strained crystalline envelope. Furthermore, surprising local increases in the diameter of the latent tracks are readily observed. This feature can be interpreted using a model based on the concept of effective local energy deposition, defined as the sum of the inelastic energy deposited by the swift track-forming ion and the elastic energy deposited by a primary knock-on atom inside the ion track. (C) 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
Published: 2013
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11. Comparison between bulk and thin foil ion irradiation of ultra high purity Fe

Author: B. Décamps, Robin Schäublin, A. Prokhodtseva, CSNSM PCI, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)
Subjects: 010302 applied physics, Nuclear and High Energy Physics, Materials science, Single beam, Analytical chemistry, 02 engineering and technology, 021001 nanoscience & nanotechnology, 01 natural sciences, Ion, Ultra high purity, Nuclear Energy and Engineering, Transmission electron microscopy, 0103 physical sciences, Radiation damage, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], General Materials Science, Irradiation, Dislocation, 0210 nano-technology, FOIL method
Abstract: Accumulation of radiation damage in ultra high purity iron under self ion irradiation without and with simultaneous He implantation was investigated in bulk and thin foil form to assess, on the one hand, the effect of free surfaces and, on the other hand, the influence of He. Specimens were irradiated at room temperature to a dose of 0.8 dpa and similar to 900 appm He content. We found in thin foils after irradiation with single beam a majority of a(0) < 100 > type loops, while in the presence of He it is the 1/2 a(0) < 111 > type loops that prevail. In single beam irradiated bulk samples most of the loops are of 1/2 a(0) < 111 > type. In both bulk and thin foils density of defects visible in transmission electron microscope is considerably higher when He is implanted with prevailing 1/2 a(0) < 111 > dislocation loops, indicating that He stabilizes them. (C) 2013 Elsevier B.V. All rights reserved.
Published: 2013
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12. Impact of He and Cr on defect accumulation in ion-irradiated ultrahigh-purity Fe(Cr) alloys

Author: Amuthan Ramar, A. Prokhodtseva, B. Décamps, Robin Schäublin, CSNSM PCI, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Microscope, Materials science, Polymers and Plastics, Ion beam, Population, Analytical chemistry, 02 engineering and technology, 01 natural sciences, 010305 fluids & plasmas, law.invention, Ion, Radiation damage, law, 0103 physical sciences, Irradiation, education, education.field_of_study, Number density, Metals and Alloys, 021001 nanoscience & nanotechnology, In situ transmission electron microscopy irradiation, Electronic, Optical and Magnetic Materials, Crystallography, Transmission electron microscopy, Fe(Cr) alloys, Ceramics and Composites, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], 0210 nano-technology
Abstract: The effect of He on the primary damage induced by irradiation in ultrahigh-purity (UHP) Fe and Fe(Cr) alloys was investigated by transmission electron microscopy (TEM). Materials were irradiated at room temperature in situ by TEM in a microscope coupled to two ion accelerators, simultaneously providing 500 keV Fe+ and 10 keV He+ ions. Single Fe ion and dual Fe and He ion beam experiments were performed up to a dose of 1 dpa and to a He content of up to 1000 appm. Defects appear in the form of nanometric black dots with sizes between 1 and 5 nm. Defocused images reveal a dense population of sub-nanometric cavities after both single-beam and dual-beam irradiation. In Fe(Cr) alloys, the number densities of visible black dot defects still resolved in TEM are significantly higher after single than after dual-beam irradiation. In UHP Fe, conversely, the presence of He strongly increases the defect number density. The presence of He changes a a(0)< 1 0 0 > dominated defect population to a 1/2a(0)< 1 1 1 > dominated one in all materials, and the more so in UHP Fe. It appears that Cr increases the number of visible defects relative to UHP Fe. The dependence with increasing Cr content is weak, however, showing only a slight decrease in the number densities. The decrease in the density of visible a(0)< 1 0 0 > loops and increase in the visible 1/2a(0)< 1 1 1 > loops in all materials when He is present supports the idea that visible a(0)< 1 0 0 > loops are formed by the interaction between mobile 1/2a(0)(1 1 1) loops, as the latter would be immobilized by He already at sub-microscopic sizes. It is concluded that the primary loop population is dominated by 1/2a(0)< 1 1 1 > loops. (C) 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
Published: 2013
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13. Effect of temperature on the behavior of ion-irradiated cubic zirconia

Author: Lionel Thomé, Frédérico Garrido, Sandra Moll, A. Debelle, Gaël Sattonnay, Jacek Jagielski, CSNSM PCI, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut de Chimie Moléculaire et des Matériaux d'Orsay (ICMMO), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC), Institute of Electronic Materials Technology (IEMT), Institute of Electronic Materials Technology, and The Andrzej Soltan Institute for Nuclear Studies
Subjects: Ceramics, Nuclear and High Energy Physics, Materials science, Analytical chemistry, 02 engineering and technology, 01 natural sciences, Ion, 0103 physical sciences, Cubic zirconia, Irradiation, Ceramic, Instrumentation, RBS, Yttria-stabilized zirconia, Channeling, 010302 applied physics, Range (particle radiation), 021001 nanoscience & nanotechnology, Rutherford backscattering spectrometry, Ion fluence, Crystallography, visual_art, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], visual_art.visual_art_medium, Zirconia, 0210 nano-technology
Abstract: Yttria-stabilized zirconia (YSZ) single crystals were irradiated with 4-MeV Au ions at several temperatures from RT up to 800 degrees C. For each temperature, the amount of damage created by irradiation was measured as a function of the ion fluence by Rutherford backscattering spectrometry in channeling geometry (RBS/C). In all cases the damage exhibits a peak around the ion projected range (similar to 500 nm) and it accumulates via a multi-step process. Furthermore, the damage build-up strongly depends on the irradiation temperature: the occurrence of the second stage of damage accumulation, which presents a high increase of the damage fraction, is shifted towards lower fluences as the temperature is increased. This effect may be explained by enhanced defect-clustering at high temperature. (C) 2011 Elsevier B.V. All rights reserved.
Published: 2012
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14. A comprehensive study of structural and magnetic properties of sputter deposited nickel–silica thin films

Author: Ramesh Chandra, R. Jayaganthan, Amit Kumar Chawla, Yogendra K. Gautam, Rajan Walia, J.C. Pivin, CSNSM PCI, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)
Subjects: Magnetic measurement, Materials science, Analytical chemistry, chemistry.chemical_element, Nanoparticle, 02 engineering and technology, 01 natural sciences, Nanocomposites, Sputtering, 0103 physical sciences, General Materials Science, Thin film, RBS, 010302 applied physics, Nanocomposite, Mechanical Engineering, Superparamagnetism, Sputter deposition, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Nickel, chemistry, Mechanics of Materials, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Particle size, 0210 nano-technology, Magnetron sputtering
Abstract: The present work reports the formation of Ni nanoparticles inside the SiO2 matrix and deals with the influence of Ni concentration on structural and magnetic properties of Ni–SiO2 nanocomposite thin films. The films with varying Ni concentration (20–55 at% measured by Rutherford back scattering spectroscopy) were deposited using DC/RF magnetron co-sputtering. TEM and XRD analysis reveal the formation of FCC Ni nanoparticles in all the samples. The particle size varies from 3 to 10 nm as a function of Ni concentration. The surface roughness of the films is also found to increase with increase in nickel concentration. Magnetic measurements show that the Ni nanoparticles behave as superparamagnets when their size is ≤6 nm, in spite of their large volume fractions. The results show that the magnetic properties of the nanoparticles can be controlled by their size and Ni concentration in the samples.
Published: 2012
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15. Structural irradiation damage and recovery in nanometric silicon carbide

Author: A. Audren, Nathalie Herlin-Boime, Yann Leconte, Lionel Thomé, D. Gosset, I. Monnet, Laboratoire d'Analyse Microstructurale des Matériaux (LA2M), Service des Recherches Métallurgiques Appliquées (SRMA), Département des Matériaux pour le Nucléaire (DMN), CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Département des Matériaux pour le Nucléaire (DMN), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire Francis PERRIN (LFP - URA 2453), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), CSNSM PCI, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Caen Normandie (UNICAEN), and Normandie Université (NU)
Subjects: SiC, Nanostructure, Materials science, Annealing (metallurgy), Nucleation, Energy Engineering and Power Technology, 02 engineering and technology, 01 natural sciences, Nanoceramic, Nuclear materials, [SPI.MAT]Engineering Sciences [physics]/Materials, chemistry.chemical_compound, 0103 physical sciences, Silicon carbide, Ceramic, Irradiation, Composite material, Safety, Risk, Reliability and Quality, Waste Management and Disposal, 010302 applied physics, 021001 nanoscience & nanotechnology, Grain size, Amorphisation, Nuclear Energy and Engineering, chemistry, Ion irradiation, 13. Climate action, visual_art, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], visual_art.visual_art_medium, Crystallite, 0210 nano-technology
Abstract: Silicon carbide is one of the candidate materials for core components of some nuclear reactor projects (Gen-IV). In order to improve their thermo-mechanical properties, materials with nanometric grain size are considered. For such materials, nearly no data concerning their behaviour under irradiation are available. In this paper, we study the damage and subsequent recovery of a nanostructured 3C–SiC ceramic. Samples were irradiated at room temperature with 4 MeV Au ions and subsequently annealed. Their structural modifications are analysed with a grazing incidence X-ray diffraction method. Results show that these nanoceramic materials present the same damage kinetics during irradiation as conventional micrometric grained SiC, with total amorphisation at the highest fluence. However, while the recrystallisation of a conventional ceramic is expected to occur through an epitaxial recrystallisation from the non-damaged parts of the large grains, the nanometric material is healed only after annealing at 1000 °C through mechanisms that can be attributed to a heterogeneous nucleation and growth of β crystallites in the totally amorphised grains.
Published: 2012
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16. Effect of composition on the behavior of pyrochlores irradiated with swift heavy ions

Author: Lionel Thomé, Gaël Sattonnay, M. Herbst-Ghysel, Isabelle Monnet, A. Calvo, Sandra Moll, C. Legros, C. Decorse, Institut de Chimie Moléculaire et des Matériaux d'Orsay (ICMMO), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC), CSNSM PCI, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252), Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Caen Normandie (UNICAEN), Normandie Université (NU), Université Paris-Sud - Paris 11 (UP11)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), and Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Nuclear and High Energy Physics, Materials science, Pyrochlore, Analytical chemistry, Mineralogy, 02 engineering and technology, engineering.material, 01 natural sciences, Pyrochlores, [SPI.MAT]Engineering Sciences [physics]/Materials, Ion, 0103 physical sciences, [SPI.GPROC]Engineering Sciences [physics]/Chemical and Process Engineering, Irradiation, Instrumentation, Chemical composition, 010302 applied physics, Ion track, 021001 nanoscience & nanotechnology, Titanate, X-ray diffraction, Amorphous solid, Ion irradiation, X-ray crystallography, engineering, 0210 nano-technology
Abstract: A 2 B 2 O 7 pyrochlores (zirconates with A = Gd, Nd, Sm or Eu, and a titanate Gd 2 Ti 2 O 7 ) were irradiated with swift heavy ions in order to investigate the effects of the chemical composition on the structural changes induced by high electronic excitation. XRD results show that the structural modifications induced by irradiation with 119 MeV U ions are strongly dependent on the sample composition: Gd 2 Ti 2 O 7 is readily amorphized, whereas Gd 2 Zr 2 O 7 is transformed into a radiation-resistant anion-deficient fluorite structure. For Sm 2 Zr 2 O 7 , Eu 2 Zr 2 O 7 and Nd 2 Zr 2 O 7 , a more complex behavior is observed since both a pyrochlore–fluorite phase transformation and amorphization occur. The results suggest that an ion track is composed of an amorphous track core surrounded by an anion-deficient fluorite shell. The diameters of different track regions were estimated by using a direct impact mechanism coupled with a single overlap process to fit the transformation build-ups. These diameters depend on the sample composition, the susceptibility to amorphization by high electronic excitation increasing with the cation radius ratio r A / r B .
Published: 2012
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17. Influence of ion energy on damage induced by Au-ion implantation in silicon carbide single crystals

Author: Patrick Simon, F. Linez, Lionel Thomé, Marie-France Barthe, Aurélie Gentils, Aurélien Canizares, CSNSM PS2, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Conditions Extrêmes et Matériaux : Haute Température et Irradiation (CEMHTI), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université d'Orléans (UO), CSNSM PCI, and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)
Subjects: FLUX, RAMAN-SCATTERING, Materials science, Analytical chemistry, 02 engineering and technology, Channelling, 01 natural sciences, Fluence, Ion, Positron annihilation spectroscopy, symbols.namesake, POSITRON, 0103 physical sciences, General Materials Science, TEMPERATURE, ACCUMULATION, 010302 applied physics, SPECTROSCOPY, Mechanical Engineering, Radiochemistry, DEFECTS, 021001 nanoscience & nanotechnology, Rutherford backscattering spectrometry, Crystallographic defect, Ion implantation, Mechanics of Materials, CERAMICS, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], symbols, 0210 nano-technology, Raman spectroscopy
Abstract: This article reports on the influence of the ion energy on the damage induced by Au-ion implantation in silicon carbide single crystals. 6H-SiC samples were implanted with Au ions at room temperature at two different energies: 4 and 20 MeV. Both Rutherford Back-scattering spectrometry in channelling geometry (RBS/C) and Raman spectroscopy were used to probe the ion implantation-induced damage. Results show that the accumulated damage increases with the fluence up to the amorphization state. RBS/C data indicate that 4-MeV implantation induces more damage than 20-MeV implantation at a given fluence. This effect is attributed to nuclear collisions since the amount of damage is identical at 4 or 20 MeV when the fluence is rescaled in dpa. Surprisingly, Raman data detect more damage for 20-MeV implantation than for 4-MeV implantation at low fluence (below 10(13) cm(-2)) where point defects are likely formed.
Published: 2011
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18. Synthesis and characterization of nc-Ge embedded in SiO2/Si matrix

Author: K.G.M. Nair, D.K. Avasthi, J.C. Pivin, Sumaira Khan, B. K. Panigrahi, S. Dhamodaran, N. Srinivasa Rao, D. Kabiraj, B. Sundaravel, Anand P. Pathak, CSNSM PCI, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)
Subjects: Nuclear and High Energy Physics, Materials science, AMORPHOUS-SILICON OXIDE, Silicon, ION-IMPLANTATION, Analytical chemistry, chemistry.chemical_element, Germanium, 02 engineering and technology, Substrate (electronics), 01 natural sciences, Fluence, GERMANIUM, symbols.namesake, Swift heavy ion, implantation, General Materials Science, SI, Irradiation, RBS, VISIBLE PHOTOLUMINESCENCE, Radiation, irradiation, 010401 analytical chemistry, OPTICAL-PROPERTIES, 021001 nanoscience & nanotechnology, Condensed Matter Physics, SIO2-FILMS, X-ray diffraction, 0104 chemical sciences, Crystallography, NANOCRYSTALS, chemistry, Raman spectroscopy, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], symbols, Crystallite, sputtering, 0210 nano-technology
Abstract: International audience; We have prepared germanium nanoparticles embedded in SiO2 matrix by atom beam co-sputtering (ABS) of Ge+SiO2 on Si substrate. The as-deposited films were annealed at various temperatures in Ar+H2 atmosphere and irradiated with various energies with fixed fluence. The pristine and irradiated samples were characterized by Raman, X-ray diffraction and atomic force microscopy (AFM). Rutherford back scattering (RBS) was used to quantify the concentration of Ge in the SiO2 matrix and the film thickness. Raman studies of the films indicate the formation of Ge crystallites as a result of swift heavy ion (SHI) irradiation. Moreover, the crystalline nature of Ge improves with an increase in energy. Glancing angle X-ray diffraction and Raman results also confirm the presence of Ge crystallites in the irradiated samples. Similarly, 400keV Ge+ ions implanted into silicon substrate at higher fluence at 573K have been irradiated with 100MeV Au8+ions at RT. These irradiated implanted samples were subsequently characterized by XRD and Raman to understand the crystallization behavior. We also studied the surface morphology of a high-energy irradiated sample by AFM. The irradiation results were compared with those obtained by thermal annealing in ABS. The basic mechanism for crystallization induced by SHI in these films has been investigated.
Published: 2009
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19. Effects of electronic and nuclear interactions in SiC

Author: Isabelle Monnet, Abdenacer Benyagoub, Y. Leconte, Xavier Portier, Lionel Thomé, F. Garrido, Cécile Reynaud, A. Audren, Nathalie Herlin-Boime, D. Gosset, M. Levalois, Service des Photons, Atomes et Molécules (SPAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252), Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Caen Normandie (UNICAEN), Normandie Université (NU), Laboratoire d'Analyse Microstructurale des Matériaux (LA2M), Service des Recherches Métallurgiques Appliquées (SRMA), Département des Matériaux pour le Nucléaire (DMN), CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Département des Matériaux pour le Nucléaire (DMN), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Laboratoire Francis PERRIN (LFP - URA 2453), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), CSNSM PCI, and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: PACS: 61.82.Rx, SiC, Diffraction, Nuclear and High Energy Physics, Grazing incidence X-ray diffraction, Materials science, Nanostructure, nanostructure, 02 engineering and technology, 01 natural sciences, Ion, Condensed Matter::Materials Science, 0103 physical sciences, Atom, Irradiation, grazing incidence X ray diffraction, Instrumentation, [PHYS]Physics [physics], 010302 applied physics, Radiation material science, irradiation, Rutherford Backscattering Spectrometry, single crystalline, 021001 nanoscience & nanotechnology, Rutherford backscattering spectrometry, Ion implantation, Chemical physics, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Atomic physics, 0210 nano-technology
Abstract: International audience; In this study, we performed irradiation experiments on nanostructured 3C–SiC samples, with 95 MeV Xe ions at room temperature. This energy permits the observation of the combined electronic and nuclear interactions with matter. The grazing incidence X-ray diffraction results do not reveal a complete amorphization, despite value of displacement per atom overcoming the total amorphization threshold. This may be attributed to competing effects between nuclear and electronic energy loss in this material since a total amorphization induced by nuclear interactions was found after low energy ion irradiation (4 MeV Au). Moreover, electronic interactions created by high energy ion irradiations induce no disorder in single crystalline 6H–SiC. But in samples previously disordered by low energy ion implantation (700 keV I), the electronic interactions generate a strong defects recovery.
Published: 2009
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20. Synthesis and characterization of Ni-doped ZnO: A transparent magnetic semiconductor

Author: D.K. Avasthi, J.C. Pivin, Babita Pandey, D. Kabiraj, Santanu Ghosh, P. C. Srivastava, CSNSM PCI, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: FERROMAGNETIC SEMICONDUCTORS, Materials science, Grazing angle X-ray diffraction, Analytical chemistry, Magnetic property, 02 engineering and technology, 01 natural sciences, Magnetization, THIN-FILMS, DESIGN, Electrical resistivity and conductivity, High-resolution transmission electron microscopy, 0103 physical sciences, NANOPARTICLES, OXIDES, Thin film, 010302 applied physics, Condensed matter physics, Doping, Transparent magnetic semiconductor, Magnetic semiconductor, Sputter deposition, Coercivity, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Electronic, Optical and Magnetic Materials, CO, ROOM-TEMPERATURE, Ferromagnetism, SPINTRONICS, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], 0210 nano-technology
Abstract: We report synthesis of a transparent magnetic semiconductor by incorporating Ni in zinc oxide (ZnO) matrix. ZnO and nickel-doped zinc oxide (ZnO: Ni) thin films (similar to 60 nm) are prepared by fast atom beam (FAB) sputtering. Both undoped and doped films show the presence of ZnO phase only. The Ni concentration ( in at%) as determined by energy dispersive X-ray (EDX) technique is similar to 12 +/- 2%. Magnetisation measurement using a SQUID magnetometer shows that the Ni-doped films are ferromagnetic, having coercivity (H(c)) values 192, 310 and 100 Oe and saturation magnetization (M(s)) values of 6.22, 5.32 and 4.73 emu/g at 5, 15 and 300 K, respectively. The Ni-doped film is transparent (> 80%) across visible wavelength range. Resistivity of the ZnO: Ni film is similar to 2.5 x 10(-3) Omega cm, which is almost two orders of magnitude lower than the resistivity (similar to 4.5 x 10(-1) Omega cm) of its undoped counterpart. Impurity d-band splitting is considered to be the cause of increase in conductivity. Interaction between free charges generated by doping and localized d spins of Ni is discussed as the reason for ferromagnetism in the ZnO: Ni film. (C) 2008 Elsevier B.V. All rights reserved.
Published: 2008
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21. Structure and magnetic properties of ZnO films doped with Co, Ni or Mn synthesized by pulsed laser deposition under low and high oxygen partial pressures

Author: J.C. Pivin, L. Vincent, Fouran Singh, Gabriel Socol, P. Berthet, Ion N. Mihailescu, Maulik K. Patel, CSNSM PCI, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut de Chimie Moléculaire et des Matériaux d'Orsay (ICMMO), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)
Subjects: Analytical chemistry, Pulsed laser deposition, Magnetic films, 02 engineering and technology, FERROMAGNETIC-RESONANCE, SEMICONDUCTORS, 01 natural sciences, law.invention, Condensed Matter::Materials Science, Paramagnetism, THIN-FILMS, Transition metal, law, 0103 physical sciences, Materials Chemistry, Texture (crystalline), Thin film, Electron paramagnetic resonance, 010302 applied physics, Chemistry, Metals and Alloys, OXIDE, BACKSCATTERING, Surfaces and Interfaces, Magnetic semiconductor, 021001 nanoscience & nanotechnology, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Ferromagnetism, ZnO, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Dilute magnetic semiconductors, 0210 nano-technology
Abstract: Zn(1-x)M(x)O (M=Co, Ni, Mn) films with different concentrations of transition metal (10-30%)were synthesized by pulsed laser deposition. The substrates were heated at 400 degrees C and the depositions were performed either under secondary vacuum or under an oxygen pressure of 30 Pa. The occurrence of ion channeling in the films during Rutherford Backscattering Analysis, together with X-ray diffraction, optical absorption and transmission electron microscopy, clearly show that the M atoms are in solid solution on Zn sites. Magnetic properties were investigated by means of magnetometry at 5 and 300 K and Electron Spin Resonance. The Zn(1-x)Co(x)O and Zn(1-x)Ni(x)O films deposited under low 02 pressure exhibit both a ferromagnetic and a paramagnetic response up to 300 K, while films deposited under high 02 pressure and Zn(1-x)Mn(x)O films are paramagnetic. Broad spin resonance peaks are recorded at room temperature, from ferromagnetic films only. The nearly isotropic magnetic response of these films, which is observed in ESR when varying the field orientation with respect to the surface, seems to indicate that the crystalline anisotropy oppose the shape anisotropy, because of the strong [001] texture of the films. (C) 2008 Elsevier B.V. All rights reserved.
Published: 2008
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22. Structural modifications in pyrochlores caused by ions in the electronic stopping regime

Author: J.C. Pivin, Adish Tyagi, S. Kailas, V. Vijayakumar, Maulik K. Patel, D.K. Avasthi, CSNSM PCI, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)
Subjects: Diffraction, Nuclear and High Energy Physics, Fission, Coordination number, Analytical chemistry, 02 engineering and technology, TRANSMUTATION, AMORPHIZATION, 01 natural sciences, Fluorite, Ion, symbols.namesake, RAMAN-SPECTROSCOPY, 0103 physical sciences, General Materials Science, Irradiation, OXIDES, TEMPERATURE, 010302 applied physics, RADIATION TOLERANCE, Chemistry, 021001 nanoscience & nanotechnology, IRRADIATION, Nuclear Energy and Engineering, X-ray crystallography, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], symbols, FLUORITE, Atomic physics, 0210 nano-technology, Raman spectroscopy, RESISTANCE
Abstract: Damage caused by swift heavy ions with three different electronic stopping powers (120 MeV Au9+ (22 keV/nm), 90 MeV I7+ (17 keV/nm) and 70 MeV Ni5+ (11 keV/nm)) in three pyrochlores (Gd2Zr2O7, Nd2Zr2O7 and Gd2Ti2O7) with progressively increasing radius ratios (r(A)/r(B) of A(2)B(2)O(7)) of cations is reported. Since I+7 is one of the ions used, these measurements also simulate fission fragment damage in pyrochlores and identify a potential host lattice for inert matrix fuel. X-ray diffraction on the irradiated materials indicate amorphization in Gd2Ti2O7 at the lowest S-e used, and a transition to anion-deficient fluorite (Fm (3) over barm) structure with about 1% decrease in volume in Nd2Zr2O7 and Gd2Zr2O7 at higher S-e. In Nd2Zr2O7 this is followed by amorphization and Gd2Zr2O7 does not amorphize even at the highest S-e employed. Raman analysis of Gd2Zr2O7 and Nd2Zr2O7, indicate an increase of Zr coordination number after irradiation and the bands become broader due to disordering. Analysis of the results shows that the radiation susceptibility of these pyrochlores in the electronic stopping regime strongly depends on the radius ratio of A to B cations and hence on the energy required for formation of cation antisites and anion Frenkel pairs, similar to their susceptibility in the nuclear stopping regime. Published by Elsevier B.V.
Published: 2008
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23. Sensitivity of ZnO films doped with Er, Ta and Co to NH3at room temperature

Author: Orlin Angelov, V. Georgieva, Valdek Mikli, D. Dimova-Malinovska, H. Nichev, J.C. Pivin, CSNSM PCI, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)
Subjects: Analytical chemistry, 02 engineering and technology, 01 natural sciences, GAS-SENSOR, THIN-FILMS, Adsorption, 0103 physical sciences, Materials Chemistry, ZINC-OXIDE, Electrical and Electronic Engineering, Thin film, 010302 applied physics, Aqueous solution, Chemistry, Doping, AL2O3, Sorption, ELECTRICAL-PROPERTIES, OPTICAL-PROPERTIES, Surfaces and Interfaces, Quartz crystal microbalance, Sputter deposition, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, AL, ZN1-XCOXO, Cavity magnetron, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], 0210 nano-technology
Abstract: International audience; The sensitivity of ZnO films, undoped and doped with Er, Ta and Co, to exposure to NH3 has been studied. The films were deposited by magnetron co-sputtering of a sintered ZnO target with chips of the different doping elements on its surface. The sensitivities of the ZnO films to exposure to NH3 were measured by the quartz crystal microbalance method using the resonance frequency shift. The adsorption process was investigated over an aqueous solution of ammonia with 100 ppm concentration. The speed and the mass of sorption were calculated on the basis of the time-frequency characteristic. (c) 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Published: 2008
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24. Ion beam irradiation of Sn films deposited on YSZ(100)

Author: Nihed Chaâbane, Patrick Trocellier, S. Poissonnet, Lionel Thomé, Service de recherches de métallurgie physique (SRMP), Département des Matériaux pour le Nucléaire (DMN), CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, CSNSM PCI, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: 010302 applied physics, Nuclear and High Energy Physics, Materials science, Ultra-high vacuum, Analytical chemistry, 02 engineering and technology, 021001 nanoscience & nanotechnology, Rutherford backscattering spectrometry, Microstructure, 01 natural sciences, Evaporation (deposition), Crystallography, Transmission electron microscopy, 0103 physical sciences, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Irradiation, Thin film, 0210 nano-technology, Instrumentation, Yttria-stabilized zirconia
Abstract: International audience; This paper reports the formation processes of crystalline Sn nanostructured films grown under ultra high vacuum conditions on monocrystalline yttria-stabilized zirconia (YSZ) substrates with (10 0) orientation. The microstructure of the films was analyzed using SEM and X-ray diffraction. Evaporation of Sit films yields crystallographically well-defined metallic islands of different shapes depending on the substrate temperature. The overall growth mechanism appears to follow the Stranski-Krastanov type. Irradiation of deposited films was performed at room temperature with 4 MeV Au2+ ions at a fluence of 10(15) cm(-2) to induce material decomposition and aggregation of host atoms. X-ray diffraction and Rutherford backscattering spectrometry (RBS) experiments conducted on Sn films deposited on YSZ(l 00) prior to and after irradiation demonstrate that ion irradiation drives a structural phase transformation for Sri and Zr-rich compositions. The microstructural evolution upon ion irradiation was also examined by cross-sectional transmission electron microscopy (TEM). (C) 2008 Published by Elsevier B.V.
Published: 2008
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25. Radiation stability of fluorite-type nuclear oxides

Author: Gaël Sattonnay, Lionel Thomé, Laetitia Vincent, Lech Nowicki, F. Garrido, CSNSM PCI, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), The Andrzej Soltan Institute for Nuclear Studies, Institut de Chimie Moléculaire et des Matériaux d'Orsay (ICMMO), and Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)
Subjects: 010302 applied physics, Inert, Nuclear and High Energy Physics, Nuclear transmutation, Chemistry, Doping, Noble gas, 02 engineering and technology, Actinide, 021001 nanoscience & nanotechnology, Channelling, 7. Clean energy, 01 natural sciences, Ion, 13. Climate action, Chemical physics, 0103 physical sciences, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Radiation damage, Atomic physics, 0210 nano-technology, Instrumentation
Abstract: International audience; Oxides with the fluorite-type structure are radiation tolerant materials. They are widely used or envisaged in hostile nuclear environments, such as nuclear fuels or inert transmutation matrices for actinide burning. Study of the radiation stability of this class of solids in various radiative fields is of major importance. Two issues which may affect the stability of materials are considered in this work: the production of radiation damage (ballistic contribution); the modification of the matrix composition by doping (chemical contribution). Both contributions may drastically affect the solid stability. Urania and zirconia single crystals were chosen as fluorite-type canonical systems. They were implanted with low-energy inert gases (He or Xe). The damage in-growth, due to both ballistic and chemical contributions, was investigated by in situ RBS/C experiments in the channelling mode and TEM. Two main steps in the disordering kinetics were observed for both inert gases. Relevant key parameters were found to be: the number of displaced lattice atoms created by the slowing-down of energetic ions during the implantation process,, the concentration of noble gas atoms in the solid which cause the formation of large stress fields surrounding gas aggregates. (C) 2008 Elsevier B.V. All rights reserved.
Published: 2008
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26. Meso and macroscopic considerations about damage accumulation processes

Author: S. Moll, Jacek Jagielski, Lionel Thomé, Magdalena Romaniec, Institute of Electronic Materials Technology (IEMT), Institute of Electronic Materials Technology, The Andrzej Soltan Institute for Nuclear Studies, CSNSM PCI, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)
Subjects: 010302 applied physics, Nuclear and High Energy Physics, CRYSTALLINE SILICON, Chemistry, Damage accumulation, COMPOSITE MODEL, 02 engineering and technology, AMORPHIZATION, 021001 nanoscience & nanotechnology, 01 natural sciences, AMORPHOUS TRANSFORMATION, IRRADIATION, MECHANISMS, Crystallography, Ion irradiation, CERAMICS, 0103 physical sciences, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Biophysics, Radiation damage, 0210 nano-technology, Instrumentation
Abstract: International audience; Meso (effect of grain size) and macroscopic ( effect of sample dimension) considerations about damage accumulation processes are discussed. Although both factors may significantly influence damage accumulation kinetics, they are not taken into account in most of currently used models. The role of meso and macroscopic factors may be explained in the framework of a recently developed model of damage accumulation (Multi-Step Damage Accumulation - MSDA), which assumes that the damage build-up can be regarded as a sequence of structural transformations triggered by the destabilization of the current structure of a crystal induced by radiation damage. (C) 2009 Elsevier B. V. All rights reserved.
Published: 2009
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27. Radiation Resistance of Fluorite-Structured Nuclear Oxides

Author: Frédérico Garrido, Sandra Moll, Lech Nowicki, Gaël Sattonnay, Lionel Thomé, Laetitia Vincent, Floyd D. McDaniel, Barney L. Doyle, CSNSM PCI, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Materials science, Ion track, Radiochemistry, radiation tolerance, radiation defects, nuclear and electronic stopping, 020206 networking & telecommunications, 02 engineering and technology, 7. Clean energy, Crystallographic defect, Fluence, Ion, Crystal, Chemical physics, fluorite-type structure, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], 0202 electrical engineering, electronic engineering, information engineering, Nuclear fusion, 020201 artificial intelligence & image processing, Irradiation, Radiation resistance
Abstract: International audience; Fluorite-structure oxides are radiation-resistant materials making them ideal candidates for uses as nuclear fuels or as inert matrices for actinide transmutation. The radiation tolerance of urania and cubic zirconia single crystals was investigated by external ion irradiation in predominating domains of electronic and nuclear stopping of bombarding particles. Damage kinetics show that the behavior of the two investigated fluorite-type oxides is almost the same: (i) at low-energy a two-stage disordering process is exhibited - first a ballistic step due to the formation of radiation-induced defects and second a crystal fragmentation induced by the formation of gas bubbles at large concentration -; (ii) at high energy a one-stage damage kinetics associated with the formation of ion tracks whose overlapping at high fluence results in the formation of nanometer-sized domains with a small disorientation.
Published: 2009
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28. Synthesis and characterizations of silver-fullerene C-70 nanocomposite

Author: D. Kabiraj, Rahul Singhal, Snehamayee Mohapatra, Giovanni Mattei, D.K. Avasthi, Dinesh C. Agarwal, Amit Kumar Chawla, Fouran Singh, Ramesh Chandra, Yogendra Kumar Mishra, J.C. Pivin, CSNSM PCI, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)
Subjects: Materials science, Fullerene, Physics and Astronomy (miscellaneous), SURFACE, Analytical chemistry, Physics::Optics, 02 engineering and technology, FILMS, 01 natural sciences, Silver nanoparticle, chemistry.chemical_compound, symbols.namesake, 0103 physical sciences, Physics::Atomic and Molecular Clusters, NANOPARTICLES, C70, PARTICLES, Surface plasmon resonance, SILICA, Absorption (electromagnetic radiation), 010302 applied physics, Nanocomposite, OPTICAL-PROPERTIES, 021001 nanoscience & nanotechnology, chemistry, Transmission electron microscopy, C70 fullerene, symbols, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], 0210 nano-technology, C-60, Raman scattering
Abstract: Films of C(70) fullerene containing silver nanoparticles were synthesized by thermal codeposition. Optical absorption studies revealed that surface plasmon resonance of Ag nanoparticles occurs at unusually large wavelength, which showed a regular redshift from 521 to 581 nm with increase in metal content from 4.5% to 28%. It is explained by the Maxwell-Garnett theory considering the absorbing nature of fullerene matrix. Rutherford backscattering and transmission electron microscopy were performed to quantify metal content and the particle size, respectively. A better detection of low intensity vibrational modes of C(70) in Raman scattering is observed due to surface enhanced Raman scattering. (c) 2008 American Institute of Physics.
Published: 2008
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29. Exciton mechanisms and modeling of the ionoluminescence in silica

Author: Fernando Agulló-López, A. Muñoz-Martín, D. Jiménez-Rey, D. Bachiller-Perea, Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM PCI), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Univ. Paris-Sud
Subjects: [PHYS]Physics [physics], Acoustics and Ultrasonics, Chemistry, Exciton, Kinetics, Thermodynamics, 02 engineering and technology, Function (mathematics), 021001 nanoscience & nanotechnology, Condensed Matter Physics, Kinetic energy, 01 natural sciences, Fluence, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, 0103 physical sciences, Irradiation, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], Atomic physics, 010306 general physics, 0210 nano-technology
Abstract: In this chapter a theoretical model is presented to discuss detailed kinetic data describing the evolution of the two main ionoluminescence (IL) bands at 650 (1.9) and 460 nm (2.7 eV) in silica as a function of the irradiation fluence at room temperature. Some of the data shown in Chap. 7 will be used in this chapter to introduce the physical model here presented. In particular, the results obtained for dry silica (IR, low OH content) will be evoked here as an introduction for the model, since this is the type of silica (of the three that were used for Chap. 7) with the highest purity. A physical model is proposed to explain the kinetics of the main IL emissions of silica, and a preliminary mathematical formulation is deduced and proved by fitting some of the data obtained in Chap. 7.
Published: 2016
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30. Magnetic properties of Mn-implanted 6H-SiC single crystal

Author: Lionel Thomé, Khalid Bouziane, Alain Declémy, M. E. Elzain, S. M. Chérif, M. Drouet, M. Al Azri, Yves Roussigné, Laboratoire des Sciences des Procédés et des Matériaux (LSPM), Université Paris 13 (UP13)-Institut Galilée-Université Sorbonne Paris Cité (USPC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique des Matériaux (PhyMat), Centre National de la Recherche Scientifique (CNRS)-Université de Poitiers, CSNSM PCI, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and Centre National de la Recherche Scientifique (CNRS)-Université Sorbonne Paris Cité (USPC)-Institut Galilée-Université Paris 13 (UP13)
Subjects: Materials science, Condensed matter physics, Magnetic structure, Magnetic moment, General Physics and Astronomy, 02 engineering and technology, Magnetic semiconductor, 021001 nanoscience & nanotechnology, SEMICONDUCTORS, FE, 01 natural sciences, FERROMAGNETISM, Condensed Matter::Materials Science, Crystallography, Ferromagnetism, Vacancy defect, 0103 physical sciences, Atom, SILICON-CARBIDE, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Physics::Atomic and Molecular Clusters, 010306 general physics, 0210 nano-technology, Single crystal, Electric field gradient
Abstract: The electronic and magnetic structures of Mn-doped 6H-SiC have been investigated using ab initio calculations. Various configurations of Mn sites and vacancy types have been considered. The calculations showed that a substitutional Mn atom at either Si or C sites possesses a magnetic moment. The Mn atom at Si site possesses larger magnetic moment than Mn atom at C site. The magnetic properties of ferromagnetically and antiferromagnetically coupled pair of Mn atoms in the presence of vacancies have also been explored. Our calculations show that antiferromagnetically coupled pair of Mn atoms at Si sites with neighboring C vacancy is magnetically more stable. Relaxation effects were also studied. The results are correlated to the measured magnetic properties obtained for Mn-implanted 6H-SiC for various Mn concentrations. (C) 2012 American Institute of Physics.
Published: 2012
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31. Synthesis, characterizations, and thermal induced structural transformation of silver-fullerene C60 nanocomposite thin films for applications in optical devices

Author: Giovanni Mattei, Dc Agarwal, Yk Mishra, D. Kabiraj, Ramesh Chandra, Dk Avasthi, Rahul Singhal, Jc Pivin, CSNSM PCI, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)
Subjects: Materials science, Fullerene, Annealing (metallurgy), METAL PARTICLES, Analytical chemistry, General Physics and Astronomy, Nanoparticle, NONLINEARITY, 02 engineering and technology, 01 natural sciences, [SPI.MAT]Engineering Sciences [physics]/Materials, Condensed Matter::Materials Science, 0103 physical sciences, C70, Physics::Atomic and Molecular Clusters, SCATTERING, GOLD, Thin film, 010302 applied physics, Nanocomposite, NANOCLUSTERS, RESONANCE, 021001 nanoscience & nanotechnology, Rutherford backscattering spectrometry, Blueshift, C60, Amorphous carbon, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], 0210 nano-technology
Abstract: Nanocomposite thin films of fullerene C(60) containing Ag nanoparticles (NPs) were synthesized by thermal codeposition. The surface plasmon resonance (SPR) band of the nanocomposite film was observed in the region 450-550 nm, showing a large redshift with increasing metal concentration. This is explained by the Maxwell-Garnett effective medium theory considering the absorbing nature of fullerene C(60). The C(60)-Ag nanocomposite thin film with lowest Ag concentration was annealed at increasing temperatures in neutral atmosphere. The SPR band showed first a small redshift after annealing at small temperature then progressive blueshift at higher temperature. This behavior of SPR is explained by the increased particle-particle interaction due to the compaction of the fullerene C(60) film upon annealing at low temperature and the transformation of fullerene C(60) matrix into amorphous carbon at higher temperature. Rutherford backscattering spectrometry and transmission electron microscopy were used to quantify Ag metal content and the microstructural evolution of Ag NPs in the nanocomposite films, respectively. Thermal induced structural transformations of fullerene C(60) molecules of host matrix were investigated by Raman spectroscopy. (C) 2010 American Institute of Physics.
Published: 2010
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32. Multistep damage evolution process in cubic zirconia irradiated with MeV ions

Author: Laetitia Vincent, Lionel Thomé, Gaël Sattonnay, Aurélien Debelle, Frédérico Garrido, Jacek Jagielski, S. Moll, CSNSM PCI, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut de Chimie Moléculaire et des Matériaux d'Orsay (ICMMO), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC), Institute of Electronic Materials Technology (IEMT), Institute of Electronic Materials Technology, and The Andrzej Soltan Institute for Nuclear Studies
Subjects: Materials science, PLUTONIUM, General Physics and Astronomy, 02 engineering and technology, FUEL, AMORPHIZATION, Channelling, 01 natural sciences, Fluence, Molecular physics, NUCLEAR-WASTE, 0103 physical sciences, Cubic zirconia, YTTRIA-STABILIZED ZIRCONIA, Irradiation, OXIDES, ACCUMULATION, 010302 applied physics, 021001 nanoscience & nanotechnology, Rutherford backscattering spectrometry, Crystallographic defect, Crystallography, RADIATION-DAMAGE, Transmission electron microscopy, CERAMICS, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], SINGLE-CRYSTALS, Dislocation, 0210 nano-technology
Abstract: This work reports the study, via the combination of Rutherford backscattering spectrometry and channeling, x-ray diffraction, and transmission electron microscopy experiments, of the damage formation in cubic yttria-stabilized zirconia single crystals irradiated with medium-energy (4 MeV) heavy (Au) ions. The damage buildup, which is accounted for in the framework of the multistep damage accumulation model, occurs in three steps. The first step at low fluences (up to 10(15) cm(-2)), characterized by a regular increase in both the damage yield and the elastic strain, is related to the formation of small defect clusters. The second step in the intermediate fluence range (from 10(15) to 5 X 10(15) cm(-2)) leads to a sharp increase in the damage yield and to a large drop of the strain due to the formation of dislocation loops which collapse into a network of tangled dislocations. The third step at high fluences (above 5 X 10(15) cm(-2)) exhibits a surprising decrease in the damage yield, which may be attributed to the reorganization of the dislocation network that leads to the formation of weakly damaged regions with a size of the order of 100 nm. (C) 2009 American Institute of Physics. [doi:10.1063/1.3236567]
Published: 2009
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33. Modification of molecular transitions in fullerene films under ion impacts

Author: Jan Misiewicz, Artur Podhorodecki, J.C. Pivin, Amit Kumar, D.K. Avasthi, Semi-conducteurs à large bande interdite (SC2G), Institut Néel (NEEL), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF), CSNSM PCI, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)
Subjects: quenching (thermal), Fullerene, Photoluminescence, infrared spectra, General Physics and Astronomy, Infrared spectroscopy, 02 engineering and technology, visible spectra, Photochemistry, 01 natural sciences, Ion, radiative lifetimes, Condensed Matter::Materials Science, 0103 physical sciences, Irradiation, Thin film, 010306 general physics, Spectroscopy, Quenching (fluorescence), Fourier transform spectra, Chemistry, fullerenes, ultraviolet spectra, 021001 nanoscience & nanotechnology, ion beam effects, thin films, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], photoluminescence, 0210 nano-technology
Abstract: The photoluminescence properties of as-deposited and 90 MeV Si ion irradiated fullerene films are reported. The irradiation of fullerene films leads to some enhancement or quenching in molecular transition intensities (photoluminescence intensities) depending on the ion fluence. These effects are explained in terms of lowering in the energy level symmetry resulting from induced chemical disordering. The structural modifications occurring upon irradiation were investigated using Fourier transform infrared and UV-vis spectroscopies.
Published: 2009
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34. Perpendicular magnetization of FePt particles in silica induced by swift heavy ion irradiation

Author: Fouran Singh, L. Vincent, J.C. Pivin, O Angelov, CSNSM PCI, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Materials science, Acoustics and Ultrasonics, Intermetallic, 02 engineering and technology, FILMS, 01 natural sciences, Ion, Condensed Matter::Materials Science, Magnetization, Swift heavy ion, Nuclear magnetic resonance, DEFORMATION, 0103 physical sciences, NANOPARTICLES, Irradiation, 010302 applied physics, Condensed matter physics, Magnetostriction, Coercivity, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Transmission electron microscopy, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], 0210 nano-technology
Abstract: Particles of the FePt intermetallic compound with L1(0) structure embedded in silica films were submitted to irradiation by 120 MeV Au ions at different fluences. Observations by transmission electron microscopy evidenced an elongation of the particles, ascribed to an anisotropic ripening process during the thermal spikes occurring in the wake of the ions. However, the observed changes in the magnetic properties are attributed to the magnetostriction of the particles. Their compression by the matrix induces a tilt of easy magnetization axis from in-plane to perpendicular to the film surface, together with an increase in coercivity.
Published: 2008
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35. Defect Induced Intrinsic Ferromagnetism in Fullerene Thin Films

Author: J.C. Pivin, Amit Kumar, D.K. Avasthi, Semi-conducteurs à large bande interdite (SC2G), Institut Néel (NEEL), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF), CSNSM PCI, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)
Subjects: Fullerene, Materials science, General Physics and Astronomy, 02 engineering and technology, 01 natural sciences, Fluence, Ion, law.invention, CARBON, Condensed Matter::Materials Science, symbols.namesake, Nuclear magnetic resonance, law, 0103 physical sciences, Physics::Atomic and Molecular Clusters, Thin film, 010306 general physics, Electron paramagnetic resonance, Condensed matter physics, General Engineering, 021001 nanoscience & nanotechnology, Ferromagnetism, Amorphous carbon, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], symbols, ELECTRON, C-60, 0210 nano-technology, Raman spectroscopy
Abstract: The occurrence of intrinsic ferromagnetism in energetic ion irradiated fullerene films is reported. The magnetic properties of irradiated fullerene films are studied by superconducting quantum interference device and electron spin resonance. Raman spectroscopy measurement has been performed to investigate the structural transformation at high fluence. The role of electronic energy density deposition by the ions on their magnetic properties is investigated. The origin of magnetic signal in irradiated films is due to the generation of an amorphous carbon network consisting sp(2)/sp(3) bonded carbon atoms. (C) 2008 The Japan Society of Applied Physics
Published: 2008
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35 results on '"CSNSM PCI"'

1. Damage accumulation in MgO irradiated with MeV Au ions at elevated temperatures

2. Multi-scale simulation of the experimental response of ion-irradiated zirconium carbide: Role of interstitial clustering

3. Damage processes in MgO irradiated with medium-energy heavy ions

4. Annealing Effect on the Structural and Magnetic Properties of Mn-Implanted 6H-SiC

5. Effects of thermal annealing on the evolution of He bubbles in zirconia

6. Experimental approach and atomistic simulations to investigate the radiation tolerance of complex oxides: Application to the amorphization of pyrochlores

7. Structural stability of Nd2Zr2O7 pyrochlore ion-irradiated in a broad energy range

8. Ion irradiation studies of silver/amorphous carbon nanocomposite thin film

9. Proton beam modification of lead white pigments

10. Effect of combined local variations in elastic and inelastic energy losses on the morphology of tracks in ion-irradiated materials

11. Comparison between bulk and thin foil ion irradiation of ultra high purity Fe

12. Impact of He and Cr on defect accumulation in ion-irradiated ultrahigh-purity Fe(Cr) alloys

13. Effect of temperature on the behavior of ion-irradiated cubic zirconia

14. A comprehensive study of structural and magnetic properties of sputter deposited nickel–silica thin films

15. Structural irradiation damage and recovery in nanometric silicon carbide

16. Effect of composition on the behavior of pyrochlores irradiated with swift heavy ions

17. Influence of ion energy on damage induced by Au-ion implantation in silicon carbide single crystals

18. Synthesis and characterization of nc-Ge embedded in SiO2/Si matrix

19. Effects of electronic and nuclear interactions in SiC

20. Synthesis and characterization of Ni-doped ZnO: A transparent magnetic semiconductor

21. Structure and magnetic properties of ZnO films doped with Co, Ni or Mn synthesized by pulsed laser deposition under low and high oxygen partial pressures

22. Structural modifications in pyrochlores caused by ions in the electronic stopping regime

23. Sensitivity of ZnO films doped with Er, Ta and Co to NH3at room temperature

24. Ion beam irradiation of Sn films deposited on YSZ(100)

25. Radiation stability of fluorite-type nuclear oxides

26. Meso and macroscopic considerations about damage accumulation processes

27. Radiation Resistance of Fluorite-Structured Nuclear Oxides

28. Synthesis and characterizations of silver-fullerene C-70 nanocomposite

29. Exciton mechanisms and modeling of the ionoluminescence in silica

30. Magnetic properties of Mn-implanted 6H-SiC single crystal

31. Synthesis, characterizations, and thermal induced structural transformation of silver-fullerene C60 nanocomposite thin films for applications in optical devices

32. Multistep damage evolution process in cubic zirconia irradiated with MeV ions

33. Modification of molecular transitions in fullerene films under ion impacts

34. Perpendicular magnetization of FePt particles in silica induced by swift heavy ion irradiation

35. Defect Induced Intrinsic Ferromagnetism in Fullerene Thin Films

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