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

Abstract

Abstract. To investigate relation between inhomogeneous structure of Ag x (GeSe 3 ) 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 GeSe 4 tetrahedral network. The first sharp diffraction peak (FSDP) located at 1.1 Å -1 is mainly contributed by GeSe 4 network, while an observed intense small angle scattering is contributed also by Ag-Ag as well as GeSe 4 network.

Local- and Intermediate-Range Order in Room Temperature Superionic Conducting Ag-GeSe3 Glasses

“…In the present study, N Se largely exceeds two (c.f. Table I), the value that would be expected from the 8 − N rule; this is in agreement with previous experimental data [8,12]. If N Se is calculated by excluding Ag atoms, the picture changes dramatically: N Se for the Ge-Se covalent network become much closer to two (see Table I), the value belonging to the 8 − N rule.…”

“…N i j from the present study, together with previous experimental [8,12] and theoretical [6] [8,12] and theoretical [6] findings. The present N i j values are, in general, in good agreement with those from previous experimental work [8,12]. However, the distinct Ag-Ge and Ge-Ge correlations are observed here, while these contributions were intentionally excluded during previous experimental studies, by imposing constraints on closest approaches in the RMC calculations.…”

“…A further structural investigation was carried out by the same group by ND and ab initio molecular dynamics (AIMD) simulation [6], where a strong evolution in the Ag-Ag correlations was observed in the Ag-Ag distance from the intermediate to short range with increasing the Ag concentration. Ohara and coworkers analyzed the structure by using high-energy XRD, ND, and EXAFS [7,8]. ND experiments with Ag isotope enriched samples were carried out by Zeidler et al [9,10] to clarify the role of Ag atoms.…”

Silver environment and covalent network rearrangement in GeS3–Ag glasses

“…The structure of ternary GeS3-Ag alloys was investigated by fitting the four measurements (XRD, ND, and EXAFS at Ge and Ag absorption edges) simultaneously. The quality of the fits is demonstrated in Previous studies on AsS2-Ag [17], GeSe3-Ag [19] and GeS2-Ag2S [31] glassy systems revealed that Ag prefers S/Se and tries to avoid the network forming cation (As/Ge). Our results show that from this point of view GeS3-Ag alloys behave in a similar way.…”

Structure of semiconducting versus fast-ion conducting glasses in the Ag–Ge–Se system

“…Photo-induced migration of Ag also occurs, which gives these materials potential use as the sensing component in electronic dosimetry [18,19]. Numerous experimental and modelling studies have been performed to investigate the atomic scale structure of glassy Ag-Ge-Se materials [17,[20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37]. However, a clear picture of the structure has yet to emerge, as befits the structural complexity.…”