Large room temperature electrocaloric strength in bulk ferroelectric ceramics: an optimum solution
作者： Satyanarayan Patel , Aditya Chauhan , Rahul Vaish
DOI: 10.1080/01411594.2015.1124274
关键词: Electrocaloric effect 、 Ceramic 、 Electric field 、 Heat capacity 、 Ferroelectric ceramics 、 Adiabatic process 、 Ferroelectricity 、 Isothermal process 、 Thermodynamics 、 Materials science
摘要: Development of a practical electrocaloric (EC) refrigeration system is hindered by four main drawbacks: (a) low adiabatic temperature change near room temperature, (b) requirement large electric field to achieve desirable change, (c) isothermal entropy and (d) thermal capacity. Here, we demonstrate that replacing Ca Sr in the bulk ceramics nominal composition Ba0.85Ca0.15-xSrxTi0.9Zr0.1O3, can address these shortcomings. Evidently, ΔT 2.4 K be obtained (303 K) at relatively (37 kV.cm−1). These numbers indicate an EC performance exceeds most materials, surpassing even those reported for advanced thin-film composites. Further, comparative analysis strength ΔT/ΔE against reveals modified optimum material, cooling applications.
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