Electrical properties of complex tungsten bronze ceramics

Abstract

This paper highlights the electrical properties of two new complex tungsten bronze ceramics (K₂Pb₂Eu₂W₂Ti₄Nb₄O₃₀ and K₂Pb₂Pr₂W₂Ti₄Nb₄O₃₀) which were prepared by high temperature mixed oxide method. Variation of impedance parameters with temperature (27–500 °C) and frequency (1 kHz to 5 MHz) shows the grain and grain boundary effects in the samples. The variation of dielectric parameters with frequency is also studied. The ac conductivity variation with temperature clearly exhibits that the materials have thermally activated transport properties of Arrhenius type.

Keywords:

• ceramics
• electrical properties
• dielectrics
• complex impedance spectroscopy