Ionic conduction path in AgGeSe superionic glass

Kawakita, Yukinobu  ; Otomo, Toshiya*; Ueno, Hiroki; Tsubota, Masami*; Kumara, L. S. R.*; Oshita, Hidetoshi*; Suzuya, Kentaro

Ag(GeSe) ternary alloy exhibits an extensive compositional range of bulk glass forming and a rapid enhancement in ionic conductivity from 10 to 10 S/cm of these glasses at Ag concentration of x=0.3 with increasing Ag content. Structural models of this material have already been proposed by reverse Monte Carlo simulation based on experimental structural data of neutron and X-ray diffractions and X-ray absorption fine structure. However, there observed micro-phase separation tendency in these glasses. This tendency might relate to formation of ionic conduction path in supercooled liquid on quenching process. The proposed models will be examined by structure factors over a wide Q range including relatively low momentum-transfer region which have been newly obtained by the total neutron scattering instrument installed at BL21 in MLF, J-PARC. This work was supported by NEDO under "Advanced Fundamental Research Project on Hydrogen Storage Materials".