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.