Published Online: 19 May 2006
AIP Conference Proceedings 832, 299 (2006);
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  • *Neutron Science Research Center, JAERI, Tokai, Ibaraki 319‐1195, Japan
  • Advanced Science Research Center, JAERI, Tokai, Ibaraki 319‐1195, Japan
  • **Institute of Materials Structure Science, KEK, 1‐1 Oho, Tsukuba 305‐0801, Japan
  • R&D Center for Materials Science and Technology, BATAN, Serpong, Tangerang 15314, Indonesia
  • §Research Reactor Institute, Kyoto University, Kumatori, Osaka 590‐0494, Japan
  • Rutherford Appleton Laboratory, ISIS, Chilton Didcot, Oxon OX11, UK
The inelastic neutron scattering measurements of superionic glass system (AgI)x(Ag2S)x(AgPO3)1−2x reveal that an excess intensity around 3 meV, the so‐called boson peak, increases with the dopant salt concentration x. The composition dependence of boson peak intensity has a systematic relation with ionic dc conductivity. These correlated features are discussed from the viewpoint of free spaces involved with the expansion of network structure by salt doping. Cooperative dynamical properties concerned with free spaces contribute to the enhancement of hopping probability of Ag+ ions. Successive hopping is promoted in order to keep electric neutrality, where the hopping events of charged ion microscopically violates the electric neutrality. These processes should result in the high ionic conductivity of superionic glasses.