0000000000315953

AUTHOR

A. Traverse

showing 2 related works from this author

Phénomènes de ségrégation dans les ferrites de titane nanométriques : apports complémentaires de différentes techniques expérimentales (DRX, XPS, EXA…

2002

Grâce a la complementarite de diverses techniques deux phenomenes de segregation ont ete mis en evidence dans les ferrites de titane nanostructures: une segregation cinetique (dite dynamique) et une segregation thermodynamique. Par des techniques d'analyse locales (MET, XPS) et statistiques (DRX...), des heterogeneites au sein des grains de poudre contenant des cations Fe 2+ ont ete mises en evidence lors de leur etude a l'air. Leur origine est cinetique et decoule d'une oxydation incomplete des cations Fe 2+ . Des affinement de Rietveld de diagrammes de diffraction des rayons X et diffraction de neutrons ont permis de montrer quant a eux que le titane ainsi que toutes les lacunes creees lo…

CrystallographyMaterials scienceGeneral Physics and AstronomyJournal de Physique IV (Proceedings)
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X-ray-absorption fine-structure study of ZnSexTe1−x alloys

2004

X-ray-absorption fine-structure experiments at different temperatures in ZnSexTe1−x (x=0, 0.1, 0.2, 0.55, 0.81, 0.93, 0.99, and 1.0) have been performed in order to obtain information about the structural relaxation and disorder effects occurring in the alloys. First and second neighbor distance distributions have been characterized at the Se and Zn K edges, using multiple-edge and multiple-scattering data analysis. The first neighbor distance distribution was found to be bimodal. The static disorder associated with the Zn–Te distance variance did not depend appreciably on composition. On the other hand, the static disorder associated with the Zn–Se distance increased as the Se content dimi…

Condensed matter physicsChemistryCrystal structureZinc compounds ; Semiconductor materials ; Order-disorder transformations ; Stoichiometry ; X-ray absorption spectra ; Debye-Waller factors ; II-VI semiconductors ; Crystal structureRelaxation (NMR)UNESCO::FÍSICAGeneral Physics and AstronomyII-VI semiconductorsCrystal structureDebye-Waller factorsStoichiometryX-ray absorption fine structureIonSemiconductor materialsX-ray absorption spectraTilt (optics):FÍSICA [UNESCO]Orientation (geometry)TetrahedronOrder-disorder transformationsZinc compoundsStoichiometry
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