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American Institute of Physics, Applied Physics Letters, 25(107), p. 252905

DOI: 10.1063/1.4938134

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Giant electrocaloric effect in lead-free Ba0.94Ca0.06Ti1−xSnxO3 ceramics with tunable Curie temperature

Journal article published in 2015 by Xiangjian Wang, Fang Tian, Chunlin Zhao ORCID, Jiagang Wu, Yang Liu ORCID, Brahim Dkhil ORCID, Ming Zhang, Zhipeng Gao, Xiaojie Lou
This paper was not found in any repository, but could be made available legally by the author.
This paper was not found in any repository, but could be made available legally by the author.

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Abstract

Electrocaloric effect in lead-free Ba0.94Ca0.06Ti1-xSnxO3 ceramics is studied using an indirect method. The Ba0.94Ca0.06Ti0.875Sn0.125O3 ceramic located near a multi-phase point shows best electrocaloric performance, which provides further experimental evidence for optimizing electrocaloric properties through constructing multiphase coexistence. Giant electrocaloric efficiency (∼0.4 K mm/kV) is achieved in this ceramic at about room temperature at a low electric field of 6 kV/cm. While large electrocaloric temperature (∼0.63 K) is obtained by further enhancing electric field (20 kV/cm), a decrease in electrocaloric efficiency (0.32 K mm/kV) is simultaneously observed, which is attributed to phase transition from first-order to more diffusive second-order under higher electric field.