CONDUCTION MECHANISM IN COMPOSITE SOLID ELECTROLYTES - PBX(2)-AL2O3 (X=CL,BR,I) SYSTEMS

Composite solid electrolytes PbX(2)-Al2O3 (X = Cl, Br, l) have been synthesized by the powder metallurgical process, and investigated by complex impedance analysis, X-ray diffraction (XRD), differential thermal analysis (DTA) and scanning electron microscope (SEM) techniques. The phase analyses reveal that the composites are two-phase systems. No chemical reaction nor solid solution formation takes place between Al2O3 and the respective matrix phases. SEM photomicrographs show that Al2O3 particles are uniformly dispersed in the matrix phase for various systems. While PbCl2-Al2O3 and PbBr2-Al2O3 composites show a decrease in conductivity over their respective pure phases; Pbl(2)-Al2O3 composites exhibit en ha need conductivity. By using the known diffusion and mobility data of the mobile species it has been shown that enhancement in conductivity is possible only in case of Pbl(2).