AN ADIABATIC HOPPING OF dc ELECTRICAL CONDUCTIVITY STUDIES ON NiO SUBSTITUTED LEAD VANADATE GLASSES

Abstract

Glasses of the system x (NiO) (50 − x) PbO: 50V 2 O 5 were prepared by melt quenching in the range x = 0 mol% to 15 mol%. Measurements are reported for dc electrical conductivity for the above compositions in the temperature range 300 K-500 K. The experimental results are analyzed with reference to various theoretical models proposed for dc electrical conduction in amorphous semiconductors. The analysis shows that at high temperatures the temperature dependence of dc conductivity is consistent with Mott's model of phonon-assisted hopping conduction, variable range hopping mechanism and Schnakenberg's model mechanism. The hopping in this system is adiabatic in nature.