Electrocaloric Effect in Sodium Bismuth Titanate Based Ferroelectric Composites

Mixed system of (1-x)Na_0.5Bi_0.5TiO₃+(x)SrTiO₃ (NBT-ST) where x=0.075, 0.125, 0.150, 0.200 ferroelectric ceramic materials are synthesized using modified pechini method. These optimized compositions are used for study of polarization versus electric field (P-E) loops. The ferroelectric response of the samples is investigated as a function of temperature. Remnant polarization of exhibited loops observed to decrease with increasing temperature. PE data is used to estimate the electrocaloric properties. Maximum entropy change, full width at half maximum, relative cooling power is obtained from theoretical calculations.