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Your search keyword '"Antonio Galdámez"' showing total 3 results
Start Over Author "Antonio Galdámez" Publisher hal ccsd
3 results on '"Antonio Galdámez"'

1. (Cu)(tet)(Cr2-xSnx)(oct)S4-ySey Spinels: Crystal Structure, Density Functional Theory Calculations, and Magnetic Behavior

Author

Silvana Moris, José Mejía-López, Octavio Peña, Antonio Galdámez, Paulina Valencia-Gálvez, P. Barahona, Universidad Catolica Del Maule, Universidad de la frontera [Chile], Pontificia Universidad Católica de Chile (UC), Institut des Sciences Chimiques de Rennes (ISCR), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA), FONDECYTComision Nacional de Investigacion Cientifica y Tecnologica (CONICYT)CONICYT FONDECYT [1161020], Chilean-French International Associated Laboratory for 'Multifunctional Molecules and Materials' (LIAM3-CNRS) [1027], Financiamiento Basal para Centros Cientificos y Tecnologicos de ExcelenciaComision Nacional de Investigacion Cientifica y Tecnologica (CONICYT)CONICYT PIA/BASAL [FB 0807], FONDEQUIP Grant [EQM140142], Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), and Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Inorganic Chemistry, Diffraction, Crystallography, Series (mathematics), Chemistry, Spinel, engineering, [CHIM]Chemical Sciences, Density functional theory, Crystal structure, Physical and Theoretical Chemistry, engineering.material
Abstract

International audience; A new series of (Cu)[CrSn]SSe compounds was prepared by solid-state reaction at high temperature. Determination of the crystal structures by single-crystal X-ray diffraction revealed that CuCrSnSSe, CuCrSnSSe, CuCrSnSSe, and CuCrSnSSe crystallize in a normal spinel-type structure (cubic 3 space group). The powder X-ray diffraction patterns and Rietveld refinements of nominal CuCrSnSSe ( = 0.2, 0.4, 0.6, 0.8, and 1.0) were consistent with single-crystal X-ray diffraction data. Raman scattering analysis revealed that the , , and three vibrational modes were observed in the spectra. The signal at ∼382 cm, corresponding to the mode, is attributed to symmetrical stretching of the chalcogen bond with respect to the tetrahedral metal. The samples with = 0.2 and 0.4 exhibited ferromagnetic behavior, characterized by large positive θ values of +261 and +189 K, respectively. In contrast, antiferromagnetic (AF) behavior was observed for CuCrSnSSe with a Néel temperature () of 18.8 K and a θ value of -36.0 K. Density functional theory (DFT) and effective magnetic moments (μ/μ) experimentally measured showed that the Sn ion is in oxidation state of 4+, i.e., diamagnetic behavior. DFT calculations revealed that the most stable magnetic state of CuCrSnSSe was AF with exchange constants for first- and second-neighbor interactions of = 56.22 cm and = -33.88 cm. Thus, the AF interactions between ferromagnetic chains in CuCrSnSSe originate from the presence of diamagnetic Sn cations.

Published
2019
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2. Crystal structure and magnetic properties of titanium-based CuTi2−xMxS4 and CuCr2−xTixSe4 chalcospinels

Author

Victor Manriquez, F. López-Vergara, Antonio Galdámez, P. Barahona, Octavio Peña, Facultad de Ciencias Básicas, Universidad Católica del Maule, Facultad de Ciencias, Departemento de Quimica, Institut des Sciences Chimiques de Rennes (ISCR), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA), Universidad Catolica Del Maule, Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), and Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Diffraction, Materials science, chemistry.chemical_element, 02 engineering and technology, Crystal structure, 010402 general chemistry, 01 natural sciences, Inorganic Chemistry, Paramagnetism, Magnetic properties, Materials Chemistry, Antiferromagnetism, [CHIM]Chemical Sciences, Physical and Theoretical Chemistry, Chalcospinel, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Magnetic susceptibility, 0104 chemical sciences, Electronic, Optical and Magnetic Materials, Crystallography, Ferromagnetism, chemistry, Ceramics and Composites, Tetrahedron, 0210 nano-technology, Titanium
Abstract

International audience; CuTi2−xMxS4 (M=Fe, Mn, Co; x=0.3, 0.5) and CuCr2−xTixSe4 (x=0.3, 0.5, 0.7) chalcospinels were synthesized by conventional solid-state reactions. Their crystal structures were determined by single-crystal X-ray diffraction. All of the phases crystallized in cubic spinel-type structures (space group, F d 3 ¯ m ). For all of the chalcospinel compounds, the edge-length distortion parameter (ELD) indicated that the most distorted polyhedron was Q[(Ti,M)3Cu], which displayed an ~8% distortion from an ideal tetrahedron structure (Q=S or Se). The Mn-based thiospinel CuMn0.3Ti1.7S4 is paramagnetic, whereas the Fe-based thiospinels (CuTi2−xFexS4; x=0.3 and 0.7) are strongly antiferromagnetic due to their spin-glass states. The magnetic susceptibility measurements indicated ferromagnetic behavior for the selenospinels (CuCr2−xTixSe4; x=0.3, 0.5 and 0.7).

Published
2014
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3. Cu2Mn1−xCoxSnS4: Novel kësterite type solid solutions

Author

F. López-Vergara, Octavio Peña, P. Barahona, Antonio Galdámez, Victor Manriquez, Facultad de Ciencias, Departemento de Quimica, Institut des Sciences Chimiques de Rennes (ISCR), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), and Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)

Subjects
02 engineering and technology, Crystal structure, engineering.material, 01 natural sciences, Inorganic Chemistry, Tetragonal crystal system, symbols.namesake, Magnetization, Synthesis, 0103 physical sciences, Materials Chemistry, Kesterite, Physical and Theoretical Chemistry, 010302 applied physics, Chemistry, Chalcogenide, [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Magnetic susceptibility, Electronic, Optical and Magnetic Materials, Crystallography, Kësterite, X-ray crystallography, Ceramics and Composites, engineering, symbols, 0210 nano-technology, Raman spectroscopy, Solid solution
Abstract

International audience; A new family of Cu2Mn1−xCoxSnS4 chalcogenides has been synthesized by conventional solid-state reactions at 850 °C. The reactions products were characterized by powder X-ray diffraction (XRD), energy-dispersive X-ray analysis (SEM-EDS), Raman spectroscopy and magnetic susceptibility. The crystal structures of two members of the solid solution series Cu2Mn0.4Co0.6SnS4 and Cu2Mn0.2Co0.8SnS4 have been determined by single-crystal X-ray diffraction. Both phases crystallize in the tetragonal kësterite-type structure (space group View the MathML sourceI4¯). The distortions of the tetrahedral volume of Cu2Mn0.4Co0.6SnS4 and Cu2Mn0.2Co0.8SnS4 were calculated and compared with the corresponding differences in the Cu2MnSnS4 (stannite-type) end-member. The compounds show nearly the same Raman spectral features. Temperature-dependent magnetization measurements (ZFC/FC) and high-temperature susceptibility indicate that these solid solutions are antiferromagnetic.

Published
2013
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