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57 results on '"Mukesh Bachhav"'

51. Investigation of O-18 enriched hematite (a-Fe2O3) by laser assisted atom probe tomography

Author

Mukesh Bachhav, Jean-Marc Bassat, Beatrice Hannoyer, Frédéric Danoix, Raphaële Danoix, Groupe de physique des matériaux (GPM), Centre National de la Recherche Scientifique (CNRS)-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)-Normandie Université (NU)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU), Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut Polytechnique de Bordeaux-Université de Bordeaux (UB), Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-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)-Institut de Recherche sur les Matériaux Avancés (IRMA), 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)-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)-Université de Caen Normandie (UNICAEN), 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), and Université de Bordeaux (UB)-Institut Polytechnique de Bordeaux-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Dimer, Oxide, Analytical chemistry, chemistry.chemical_element, 02 engineering and technology, Atom probe, 01 natural sciences, Oxygen, Iron oxides, law.invention, Laser assisted atom probe tomography, chemistry.chemical_compound, law, 0103 physical sciences, Molecule, Physical and Theoretical Chemistry, Instrumentation, Spectroscopy, 010302 applied physics, Oxygen-18, Mass spectrometry, [CHIM.MATE]Chemical Sciences/Material chemistry, Hematite, 021001 nanoscience & nanotechnology, Condensed Matter Physics, chemistry, Isotopic measurements, visual_art, visual_art.visual_art_medium, 0210 nano-technology, Stoichiometry
Abstract

International audience; Quantitative composition measurements of metal-oxides by atom probe tomography (APT) face the problem of the nature of the oxygen peak at 16 Da. Due to a possible overlap between singly charged monomer (O+) and doubly charged dimer (O22+), the contribution of this peak to the total amount of oxygen in the analyzed samples is still matter of debate. In order to study this issue, laser assisted APT was used to analyze hematite (α-Fe2O3) samples containing large amounts of oxygen 18. Peak identification reveals that only singly charged monomers (O+) are detected, and that oxygen in detected water molecules does not originate from the oxide samples. With this information, composition of hematite measured by APT is found to be close, but not equal to the expected stoichiometry.

Published
2013

52. Investigation of wüstite (Fe1-xO) by femtosecond laser assisted atom probe tomography

Author

Frédéric Danoix, François Vurpillot, Beatrice Hannoyer, Satishchandra Ogale, R. Danoix, and Mukesh Bachhav

Subjects
Materials science, Field (physics), business.industry, Atom probe, engineering.material, Laser, Evaporation (deposition), Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, law.invention, X-ray laser, Optics, law, Femtosecond, engineering, Wüstite, business, Instrumentation, Voltage
Abstract

In this paper, we report results obtained from laser assisted three-dimensional (3-D) atom probe tomography (APT) on wustite (Fe(1-x)O). Oxides are generally insulating and hence hard to analyse in conventional electrical assisted APT. To overcome this problem, femtosecond laser pulses are used instead of voltage pulses. Here we discuss some aspects of pulsed laser field evaporation and optimization of parameters to achieve better chemical accuracy.

Published
2010

54. Atom Probe Tomography Study of In-Doped ZnO

Author

Allen H. Hunter, Emmanuelle A. Marquis, Mukesh Bachhav, Xin Liang, David R. Clarke, Mor Baram, and D.C. Bell

Subjects
Materials science, business.industry, law, Doping, Optoelectronics, Atom probe, business, Instrumentation, law.invention
Abstract

Extended abstract of a paper presented at Microscopy and Microanalysis 2013 in Indianapolis, Indiana, USA, August 4 – August 8, 2013.

Published
2013

55. Quantitative Compositional Analysis of Fluorhydroxyapatite by Atom Probe Tomography

Author

Mukesh Bachhav, Adam McFarland, Emmanuelle A. Marquis, S.-R. Chang, and B. Clarkson

Subjects
Materials science, Nuclear magnetic resonance, law, Atom probe, Instrumentation, law.invention
Abstract

Extended abstract of a paper presented at Microscopy and Microanalysis 2013 in Indianapolis, Indiana, USA, August 4 – August 8, 2013.

Published
2013

56. Measuring Chemical Segregation at Grain Boundaries by Atom Probe Tomography

Author

Mukesh Bachhav, Emmanuelle A. Marquis, Yimeng Chen, and B. Geiser

Subjects
Crystallography, Materials science, law, Grain boundary, Atom probe, Instrumentation, Molecular physics, law.invention
Abstract

Extended abstract of a paper presented at Microscopy and Microanalysis 2013 in Indianapolis, Indiana, USA, August 4 – August 8, 2013.

Published
2013

57. Evidence of lateral heat transfer during laser assisted atom probe tomography analysis of large band gap materials

Author

Beatrice Hannoyer, Frédéric Danoix, Raphaële Danoix, Mukesh Bachhav, Satishchandra Ogale, and François Vurpillot

Subjects
Materials science, Physics and Astronomy (miscellaneous), medicine.diagnostic_test, Band gap, Far-infrared laser, Analytical chemistry, Atom probe, Thermal diffusivity, Laser, Molecular physics, law.invention, law, Heat transfer, medicine, Optical tomography, Absorption (electromagnetic radiation)
Abstract

Investigation of wustite (FeO), iron (Fe), and silicon (Si) specimens by infrared laser assisted three dimensional atom probe tomography shows evidence of confined surface absorption of the laser energy as the mechanism of laser assisted field evaporation for high band gap materials. The absorption region is shown to be located on the laser illumination side, close to the specimen apex. A simple model based on thermal diffusivity and spatial extent of the absorption region is derived and applied to the experimental results. The values of thermal diffusivity thus obtained are in good agreement with the published data.

Published
2011

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