Calculation of electrocaloric properties of ferroelectric SrBi₂Ta₂O₉

Abstract

Theoretical work on the dependence of polarization on variation of temperature for ferroelectric SrBi₂Ta₂O₉ due to applied electric field shift ΔE was done, showing good agreement with experimental data of previous work. Phenomenological model and thermodynamic calculation predicted electrocaloric entropy changes, heat capacity changes, and temperature changes as a function of temperature under different electric field shifts. Maximum entropy change, relative cooling, and refrigerant capacity due to applied electric field shift were calculated.

Keywords:

• electrocaloric effect
• model
• polarization
• entropy change
• heat capacity change
• relative cooling power
• refrigerant capacity