Dielectric and impedance properties of Ba2Sr3DyTi3V7O30 ceramics

Abstract

A new member of tungsten bronze family, Ba2Sr3DyTi3V7O30, was synthesized by a high-temperature solid-state reaction method. Studies of structural by X ray diffraction technique and micro-structural by scanning electron microscope brings out orthorhombic crystal structure and densely packed nonuniform grains for the above ceramic system. Detailed dielectric studies as a function of temperature (30–500 °C) at different frequencies (1–1,000 kHz) reveals diffuse-phase-transition and loss anomaly at 81 °C. Detailed studies of impedance parameters provide a better understanding of the electrical properties and type of relaxation processes in the material. Temperature variation of dc and ac conductivity shows that this compound exhibits negative temperature coefficient of resistance. The frequency variation of ac conductivity shows that the compound obeys Jonscher’s universal power law.