Structural characterization ofAg2GeS3glass by anomalous wide-angle x-ray scattering
| Autor: | B. Bouchet-Fabre, Pascale Armand, Alain Ibanez, Jean-Marc Tonnerre, Etienne Philippot |
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| Rok vydání: | 1997 |
| Předmět: |
Diffraction
Materials science business.industry Scattering chemistry.chemical_element Order (ring theory) Germanium Condensed Matter::Disordered Systems and Neural Networks Crystallography Optics Distribution function chemistry Ionic conductivity Wide-angle X-ray scattering Structure factor business |
| Zdroj: | Physical Review B. 56:10852-10859 |
| ISSN: | 1095-3795 0163-1829 |
| Popis: | Germanium and silver atomic surroundings of ${\mathrm{Ag}}_{2}{\mathrm{GeS}}_{3}$ glass have been studied by anomalous wide-angle x-ray scattering. The structural parameters deriving from the simulations of the differential distribution functions, characterizing selectively Ge and Ag environments, show that the medium-range order of the glass up to 5 \AA{} is close to that of the crystallized reference $\ensuremath{\alpha}\ensuremath{-}{\mathrm{Ag}}_{8}{\mathrm{GeS}}_{6}.$ The absence of a first sharp diffraction peak on the structure factor around $Q=1{\AA{}}^{\ensuremath{-}1},$ can be explained by the lack of Ge-Ge correlations in the medium-range order. Finally, these results allow us to discuss the validity of several structural models proposed to explain the ionic conduction in glasses. |
| Databáze: | OpenAIRE |
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