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Journal Articles

Low energy vibrational excitations characteristic of superionic glass

Nakamura, Mitsutaka; Iwase, Hiroki; Arai, Masatoshi; Kartini, E.*; Russina, M.*; Yokoo, Tetsuya*; Taylor, J. W.*

Physica B; Condensed Matter, 385-386(1), p.552 - 554, 2006/11

https://doi.org/10.1016/j.physb.2006.05.274

Times Cited Count：3 Percentile：17.95(Physics, Condensed Matter)

The mechanism of high ionic conductivity in superionic glass constitute an unsolved problem in the field of science.Here we performed inelastic neutron scattering measurements of superionic glass system (AgI) $_{x}$ (Ag $_{2}$ S) $_{x}$ (AgPO $_{3}$ ) $_{1-2x}$ by using MARI spectrometer at ISIS, and found that the -dependence of inelastic intensity in the energy region from 1 to 3 meV of superionic phase glass shows an excess intensity above =1.8 $AA$^{-1}$$ compared with insulator phase one. Similar phenomena were also observed in another superionic glass (AgI) $_{0.5}$ (AgPO $_{3}$ ) $_{0.5}$ by using NEAT spectrometer at HMI with high resolution measurement. These results clearly suggest peculiar low energy vibrational excitations should be universal features of superionic glass.

Journal Articles

Unique vibrational excitations in superionic conducting glass

Nakamura, Mitsutaka; Arai, Masatoshi; Kartini, E.*; Taylor, J. W.*; Russina, M.*

AIP Conference Proceedings 832, p.504 - 507, 2006/05

https://doi.org/10.1063/1.2204548

Superionic glasses (AgI) $_{0.33}$ (Ag $_{2}$ S) $_{0.33}$ (AgPO $_{3}$ ) $_{0.34}$ and (AgI) $_{0.5}$ (AgPO $_{3}$ ) $_{0.5}$ have high ionic conductivity at room temperature ( $sigmasim10^{-2}$ S/cm). The inelastic neutron scattering measurements show that the superionic glass has larger intensity in low-energy region compared with undoped insulator glass (AgPO $_{3}$ ). For superionic glasses we find an excess intensity above =1.8 $AA$^{-1}$$ and peak profile at around 2.2 $AA$^{-1}$$ by investigating the -dependent features in low-energy region. These phenomena should be universal features of silver-salt superionic glass. We suppose that Ag-Ag dynamical correlation should promote the successive hopping process, and result in high ionic conductivity.