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Unique vibrational excitations in superionic conducting glass

超イオン伝導体ガラスにおける特異な振動励起

中村 充孝   ; 新井 正敏; Kartini, E.*; Taylor, J. W.*; Russina, M.*

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

超イオン伝導体ガラス(AgI)$$_{0.33}$$(Ag$$_{2}$$S)$$_{0.33}$$(AgPO$$_{3}$$)$$_{0.34}$$と(AgI)$$_{0.5}$$(AGPO$$_{3}$$)$$_{0.5}$$は室温で$$sigma$$$$sim$$10$$^{-2}$$S/cmにも及ぶ高いイオン伝導度を有する。非弾性中性子散乱測定により、超イオン伝導体ガラスがドープしていない絶縁体ガラス(AgPO$$_{3}$$)に比べて、より大きな強度を低エネルギー領域で示すことが明らかになった。低エネルギー領域での$$Q$$依存性を調べることにより、超イオン伝導体ガラスでは、$$Q$$=1.8$AA $^{-1}$$以上の領域で過剰な強度を持ち、2.2$AA $^{-1}$$付近にピークを示すことを見いだした。これらの現象は銀系の超イオン伝導体ガラスの普遍的な特徴である。われわれはAg-Agの動的相関が連続的なホッピング過程を促進し、その結果として高いイオン伝導を引き起こすと考えた。

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 $$Q$$=1.8$AA$^{-1}$$ and peak profile at around 2.2$AA$^{-1}$$ by investigating the $$Q$$-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.

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