Structural and Dielectric Investigations on x[Ba0.7Ca0.3TiO3]-(1-x)[BaZr0.2Ti0.8O3] Lead-Free Mixed Ceramic Compositions

S.S. Mane, D.J. Salunkhe

Abstract: Lead-free nanopowders of Ba0.7Ca0.3TiO3 (BCT) and BaZr0.2Ti0.8O3 (BZT) were prepared using a solid-state reaction technique. The nanoparticles are used to form composites xBCT- (1-x) BZT for x = 0.40, 0.45 and 0.50 with 2wt % Bi2O3 as a sintering aid. The structural, microstructural, dielectric properties and polarisation of the composites have been investigated and discussed. All the samples possess pure perovskite structure. The result on variation of dielectric constant with temperature and frequency are promising and suggest usefulness of composites as a RF dielectric material, in paraelectric region. The investigations on the P-E hysteresis loop reveal that all the compositions possess useful values of maximum polarization (Pmax) and remnant polarization (Pr). The present observations suggest that, the xBCT- (1-x) BZT could be a useful ferroelectric system.

Keywords: Composites, Solid-state reaction, Microstructure, Dielectric properties