Investigation of structure, microstructure, impedance, dielectric and transport properties of sodium tungstate titanate: Na(W1/2Ti1/2)O3

Abstract

In this communication, the detailed studies of structure, microstructure, impedance, dielectric and transport properties of the distorted perovskite sodium tungstate titanate(Na(W1/2Ti1/2)O3) have been reported. X-ray structural analysis confirms the formation of a single-phase rhombohedral structure. The comprehensive investigations of dielectric, impedance, electric modulus, conductivity and leakage current characteristics of Na(W1/2Ti1/2)O3 have been carried out in a wide range of frequency (1 kHz to 1 MHz) and temperature (25° to 500°C). The Maxwell-Wagner interfacial polarization is found to be responsible for the high dielectric constant and low tangent loss at low frequency (∼1 kHz). The electrical process of the material is mostly dependent on the grains and grain boundaries contributions. The study of electrical transport (conductivity) reveals that the compound (Na(W1/2Ti1/2)O3) obeys the Jonscher’s power law. From the study of the leakage-current characteristics, it can be concluded that the compound has low-leakage current indicating a good insulation property which is useful for some device applications.