Evidence of Percolation transition in superionic conductor glasses

超离子导体玻璃中渗流转变的证据

• 批准号: 05640432
• 负责人: KAWAMURA Junichi
• 金额: $ 1.34万
• 依托单位: Hokkaido University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1993
• 资助国家: 日本
• 起止时间: 1993 至 1994
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05640432/
• 关键词: superionic conductor glass; percolation transition; ionic conductivity; neutron scattering; パーコレーション転移; 交流伝導度; 中性子準弾性散乱; 中性子小角散乱; マルチ・フラクタル; 有機無機混合系ガラス; 超イオン導電体; ガラス; 緩和; 臨界指数; 中距離秩序

Percolation theory is one of the promising candidates for explaining universal frequency response in superionic conductor glasses. However, there had been found no real glasses exhibiting a good percolation threshold from ionic conductor to insulator.In this research project, authors found a clear evidence of percolation transition from superionic conductor to insulators in newly developed organic-inorganic mixed ionic conductor glasses such as AgI-alkylammonium iodides. At higher concentration of AgI the glasses are very good ionic conductors, however below a thresholdphi=0.35 their conductivities are below 10^<-8> S/cm and are almost insulator.The intermediate range structure of the glasses were investigated by neutron-small angle scattering which revealed the inhomogeneous structure in nano meter scale with fractal dimension 2.8 close to the value predicted by the percolation theory.

渗流理论是解释超离子导体玻璃普遍频率响应的有前途的候选理论之一。然而，还没有发现真正的玻璃具有良好的从离子导体到绝缘体的渗流阈值。在本研究项目中，作者发现了新开发的有机-无机混合离子导体玻璃(如AgI-烷基碘化铵)从快离子导体到绝缘体的渗流转变的明确证据。在AgI浓度较高时，玻璃是很好的离子导体，而在阈值dphi=0.35时，玻璃的电导率低于10^&lt；-8；S/cm，几乎是绝缘体。用中子-小角散射研究了玻璃的中程结构，发现玻璃在纳米尺度上具有不均匀的结构，其分维为2.8，接近渗流理论的预测值。

项目成果

J.Kawamura: "Neutron scattering from AgI-CsI-(CH_3)_4NI glasses" Solid State Ionics. 79. 264-272 (1995)

J.Kawamura：“AgI-CsI-(CH_3)_4NI 玻璃的中子散射”固态离子学。

J.Kawamura: "Intermediate range structure of organic-inorganic mixed superionic conductor glasses : AgI and tetraalklammonium iodides" Solid State Ionics. 86-88. 517-520 (1996)

J.Kawamura：“有机-无机混合超离子导体玻璃的中间范围结构：AgI和四烷基碘化铵”固态离子学。

T.Kamiyama and Y.Nakamura: "AgI-CsI-(CH_3)_4 NI Superionic glasses." Solid State Ionics. (印刷中).

T. Kamiyama 和 Y. Nakamura：“AgI-CsI-(CH_3)_4 NI 超离子玻璃。”（正在出版）。

J.Kawamura: "Frequency dependent conductivity of organic-inorganic mixed superionic conductor glasses" Solid State Ionics. (in press). (1998)

J.Kawamura：“有机-无机混合超离子导体玻璃的频率相关电导率”固态离子学。

J.Kawamura: "Photoelectrochemical pvoperties of multi-layered thin films composed of chalcogenide and superionic conductor glasses" Solid State Ionics. 90. 303-306 (1996)

J.Kawamura：“由硫属化物和超离子导体玻璃组成的多层薄膜的光电化学性能”固态离子学。