On the structure of Ge–As–Te–Cu glasses

Pal Jóvári (1) , Pierre Lucas (2) , Zhiyong Yang (2) , Bruno Bureau (3) , Ivan Kaban (4) , Brigitte Beuneu (5) , Claudia Pantalei (5) , Jozef Bednarčik (6)

1 Institute for Solid State Physics [Budapest]
2 Department of Materials Science and Engineering
3 ISCR - Institut des Sciences Chimiques de Rennes
4 Institute for Complex Materials
5 LLB - UMR 12 - Laboratoire Léon Brillouin
6 DESY - Deutsches Elektronen-Synchrotron [Hamburg]

Short range order in glassy 0.9(Ge0.1As0.15Te0.75)–0.1Cu (GATC1) and 0.9(Ge0.05As0.55Te0.4)–0.1Cu (GATC2) was studied by neutron- and X-ray diffraction as well as EXAFS (extended X-ray absorption fine structure) measurements at the K-edges of all components. The reverse Monte Carlo simulation technique was used to create models consistent with all experimental datasets. It was found that Cu binds predominantly to Te in GATC1 while Cu–As and Cu–Cu bonding is also significant in GATC2. Ge and As atoms have 4 and 3 Ge/As/Te neighbors in both compositions. In GATC1 the formation of ‘extra’ Te–Te bonds can be observed, similarly to GeTe4–AgI glasses

Keywords: EXAFS; Glass structure; Infrared glasses; neutron diffraction; Reverse Monte Carlo simulation; X-ray diffraction

Domains: Chemical Sciences; Chemical Sciences; Material chemistry

Pal Jóvári, Pierre Lucas, Zhiyong Yang, Bruno Bureau, Ivan Kaban, et al.. On the structure of Ge–As–Te–Cu glasses. Journal of Non-Crystalline Solids, 2016, 433, pp.1--5. ⟨10.1016/j.jnoncrysol.2015.11.003⟩. ⟨hal-01236430⟩