Local Structure of Superionic Glass Ag_x(GeSe₃)_1-x, x=0.565

¹ Department of Physics, Graduate School of Sciences, Kyushu University, Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan
² Research and Utilization Division, Japan Synchrotron Radiation Research Institute (JASRI, Spring-8), 1-1-1 Koto, Sayocho, Sayo-gun, Hyogo 679-5198, Japan
³ J-PARC, Japan Atomic Energy Agency, 2-4 Shirakata Shirane, Tokai, Naka, Ibaraki 319-1195, Japan
⁴ Research Institute for Solid State Physics and Optics, Hungarian Academy of Sciences, H-1525 Budapest, P.O.B. 49, Hungary
⁵ Department of Physics, Faculty of Sciences, Kyushu University, 6-10-1 Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan
⁶ Beamline Department, Pohang Accelerator Laboratory, Pohang University of Science and Technology, San31, Hyoja– doing, Pohang, 790-784, Korea
⁷ Laboratoire Léon Brillouin, CEA/Saclay, 91191 Gif-Sur-Yvette Cedex, France

Abstract

To investigate relation between inhomogeneous structure of Ag_x(GeSe₃)_1-x superionic glass and conduction path formation, x-ray diffraction, neutron diffraction and EXAFS measurements on K-edges for each constituent were performed. Reverse Monte Carlo structural modelling based on these experimental data revealed that Ag conduction paths are formed in random glass media of GeSe⁴ tetrahedral network. The first sharp diffraction peak (FSDP) located at 1.1 Å^-1 is mainly contributed by GeSe⁴ network, while an observed intense small angle scattering is contributed also by Ag-Ag as well as GeSe⁴ network.