Pyroelectric properties of the sr-doped ferroelectric barium iron niobate

Abstract

Ceramic material showing ferroelectric behaviour are being used in many optics and electro-optics application. A large number of applications of ferroelectric ceramics also exploit properties that are an indirect consequence of ferroelectricity, such as dielectric, piezoelectric and electro-optic properties. Ferroelectric relxors with high Curie temperature have been prepared by usual ceramic technique. All the samples of (Ba1-xS rx)(Fe0:5Nb0:5)O3 [BSFN] were characterized at room temperature by X-Ray diffraction using Cu-Ka radiation and found to have single phase and cubic structure. Pyroelectric measurements were carried out in the temperature range 25°C to 400°C. The pyroelectric prperties of Sr-doped ferroelectric BSFN and their solid solutions were investigated in the temperature range covering their transition points. In these ceramics, a peak in pyroelectric currents and coe±cients were observed at Curie temperatures. These Curie temperatures are consistent with that investigated in dielectric and hysteresis property. It is observed that the peak value of current and coe±cient changes with Sr-concentration.