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Atomic Structure of As34Se51Ag15 and As34Te51Ag15 Glasses Studied with Xrd, Nd and Exafs and Modeled with Rmc

2009; Springer Nature (Netherlands); Linguagem: Inglês

10.1007/978-1-4020-9916-8_37

1874-6535

I. Kaban, W. Hoyer, P. Jóvári, T. Petkova, Ani Stoilova, A. Schöps, Jozef Bednarčík, B. Beuneu,

X-ray Spectroscopy and Fluorescence Analysis

As34Se51Ag15 and As34Te51Ag15 glasses have been studied with high energy X-ray diffraction, neutron diffraction and extended X-ray absorption spectroscopy. The experimental data were modeled simultaneously with the reverse Monte Carlo simulation method. The combination of these independent measurements together with the application of some plausible physical constraints allowed the separation of the partial pair correlation functions and the estimation of the coordination numbers. An analysis of the results revealed that Ag—Se/Te bonds are preferred to Ag—As ones. The chemically ordered structure of As2Se3 remains essentially intact in As34Se51Ag15, while for As34Te51Ag15 alloying with Ag results in an increase of As—As and Te—Te bonds.