Abstract
The mechanism of high ionic conductivity in superionic conducting glass still constitutes an unsolved problem in the field of science. We performed the inelastic neutron scattering measurements of superionic glass system (AgI)x(Ag2S)x(AgPO3)1-2x using the chopper spectrometer at high flux neutron spallation source. The dynamical properties over the wide range momentum-energy space were precisely compared between superionic glass and insulator glass. We found that the superionic glass shows larger intensity in low-energy region compared with undoped insulator glass, and the increase of low-energy intensity is undoubtedly correlated with the dc ionic conductivity. We also found the peculiar Q dynamics of low-energy excitation in superionic glass indicating the in-phase dynamical correlations. These characteristic features in low-energy dynamics must provide the new insight on the mechanism of superionic glass.
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