Proton conductivity of M x H3-x PX12O40 and M x H4-x SiX12O40 (M = Rb, Cs; X = W, Mo) acid salts of heteropolyacids

被引:20
作者
Safronova, E. Yu. [1 ]
Osipov, A. K. [1 ]
Baranchikov, A. E. [1 ]
Yaroslavtsev, A. B. [1 ]
机构
[1] Russian Acad Sci, Kurnakov Inst Gen & Inorgan Chem, Moscow 119991, Russia
关键词
Acid Salt; Alkali Metal Cation; High Proton Conductivity; Cesium Carbonate; Rubidium Nitrate;
D O I
10.1134/S0020168515110102
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We have studied the electrical conductivity of rubidium and cesium acid salts of tungstophosphoric, tungstosilicic, molybdophosphoric, and molybdosilicic heteropolyacids. The materials have the form of hollow spheres up to 2 mu m in size, and their surface layer is formed by nanoparticles. The ionic conductivity of the salts has been measured at different relative humidities (from 30 to 95%) in a wide temperature range (from-40 to 90A degrees C). The highest conductivity is offered by the Rb (x) H4-x SiW12O40 samples (sigma = 5.3 x 10(-4) S/cm at 30A degrees C and 30% RH). Near 0A degrees C, the materials undergo a phase transition which involves water crystallization and a change in activation energy, but their high proton conductivity persists even at negative temperatures.
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页码:1157 / 1162
页数:6
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