Electrical Transport and Phase Transition Study of Solid Electrolyte Li3VO4 : x Li3PO4

Electrical conductivity (sigma) and Seebeck coefficient (S) measurements have been performed from 400 K to the melting point of the solid electrolyte Li3VO4 : x Li3PO4 with x = 0.0, 0.5, 1.0, and 2.0. Solidified melt was used for the measurements. The melting points of the solids increase with in increase of x. The solids of the studied system show superionic phase with x >= 1. In the superionic phase the electronic contribution to conductivity is very small. However, it is appreciable in the lower temperature region. Thus the solids are mixed conductors with dominant ionic conductivity. Ionic and electronic contributions towards the conductivity are also separated. Molar magnetic Susceptibility (X-M) and dielectric constant (epsilon) measurements show anomalies at the phase transition temperature (T-p) which are also reflected in the sigma and S data.