Effect of processing conditions on the piezoelectric constant and Curie temperature of Ba0.7Sr0.3TiO3 piezoelectric ceramics

Abstract

The materials possessing high dielectric constant with high breakdown strength are considered as a potential candidate for the storage of electrostatic energy in capacitors. The ferroelectric materials have high dielectric constant with low dielectric breakdown strength. The samples Ba0.7Sr0.3TiO3 were synthesized by solid state reaction route at different sintering temperatures. The structural studies were employed using XRD with Rietveld refinement and suggest P4mm symmetry. The micro-structural studies reveal the formation of dense grains. Moreover, the water-mark and lamellar features of domain structures observed in micrographs have increased with the increase in sintering temperature. The real part of dielectric permittivity has observed to increase with the increase in sintering temperature. Whereas, phase transition temperature decreased with the increase in sintering temperature. The increase in number of domain structures and reduction in transition temperature led to the increase in the value of piezoelectric coefficient (∼ 133 pC/N). © 2018 Author(s).