Impact of High Heat Treatment on Ferroelectric Materials Properties: Ba_1−xSr_xTiO₃ as a Model

Abstract

Ferroelectric materials differ from other dielectrics because their polarization stays after removing the external field. Hysteresis loops describe a wide range of behavior in engineering, chemistry, and physics disciplines. Sol-gel has prepared barium strontium titanate (Ba0.7Sr0.3TiO3; BST) nanocrystalline ceramics. Ba1-xSrxTiO3 crystal size increased as the sintering temperatures elevated from 900 °C to 1200 °C. The XRD patterns of Ba0.7Sr0.3TiO3 exhibited a tetragonal phase. (FESEM) used to measure the average particle size. The relationships between crystal size, dielectric and ferroelectric properties were investigated, showing better dielectric and piezoelectric parameters with increasing crystal and particle size. The increasing particle size also slightly shifted the curie transition temperature towards higher temperatures. The coercive field of Ba0.7Sr0.3TiO3 goes down as the crystal size increases, but the remnant and spontaneous polarization get better. This material is advantageous for applications in tunable capacitor devices.