Composite solid electrolytes were prepared by using powder metallurgical methods, and were studied by using complex impedance, X-ray diffraction, differential thermal analysis and scanning electron microscopic techniques. The phase analyses revealed that the composites were 2-phase systems. No chemical reaction or solid-solution formation occurred between the oxide and the matrix phase. Scanning electron microscopic photomicrographs showed that the oxide particles were uniformly dispersed within the matrix phase. It was found that, whereas the PbCl2-Al2O3 and PbBr2-Al2O3 composites exhibited a decrease in conductivity over their respective pure phases. The PbI2-Al2O3 composites exhibited an enhanced conductivity. By using known diffusion and mobility data on the mobile species, it was shown that an enhancement of conductivity was possible only in case of PbI2.

A.Kumar, K.Shahi: Journal of Materials Science, 1995, 30[17], 4407-16