Abstract
Development of a practical electrocaloric (EC) refrigeration system is hindered by four main drawbacks: (a) low adiabatic temperature change near room temperature, (b) requirement of large electric field to achieve desirable temperature change, (c) low isothermal entropy change and (d) low thermal capacity. Here, we demonstrate that replacing Ca by Sr in the bulk ceramics of nominal composition Ba0.85Ca0.15-xSrxTi0.9Zr0.1O3, can address these shortcomings. Evidently, a large of 2.4 K can be obtained near room temperature (303 K) at relatively low electric field (37 kV.cm−1). These numbers indicate an EC performance that exceeds most bulk materials, surpassing even those reported for advanced thin-film composites. Further, a comparative analysis of the EC strength against reveals that the Sr modified composition is the optimum material, for EC cooling applications.
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