Abstract
Solid-state refrigeration systems employing bulk ferroelectric materials suffer from two main drawbacks of low temperature change and high depolarization temperature which prevent rapid commercialization. In this regard, the beneficial effects of Fe-doping on the electrocaloric performance of bulk ceramics with nominal composition Ba0.85Ca0.15Zr0.1Ti0.9−xFexO3 (BCZTO-Fe) have been investigated. Indirect predictions were made using Maxwell's relations in conjunction with data from experimental observations. It was revealed that 1% Fe doping can greatly improve the performance of BCZTO based compositions. A peak adiabatic temperature change of 0.86K (345K) was predicted for 0–37kV/cm electric field, significantly higher (>100%) than pristine BCZTO ceramic. While a simultaneous increase in specific entropy change was also observed. The values indicate a huge improvement of the caloric capacity at reduced temperature indicating the benefits of such doping.
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