Large electrocaloric effect induced by the multi-domain to mono-domain transition in ferroelectrics
Large electrocaloric effect induced by the multi-domain to mono-domain transition in ferroelectrics
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DOI：
10.1063/1.4873112
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发表时间：
2014-04-28
影响因子：
3.2
通讯作者：
Kitamura, Takayuki
中科院分区：
文献类型：
--
作者：
Wang, Jie;Liu, Man;Kitamura, Takayuki
利用相场模型研究了多磁区铁电材料的电热性质。模拟结果表明，温度驱动的多磁区向单磁区转变的外在贡献显著提高了电热响应。由于在磁畴转变过程中电场方向的极化急剧减小，铁电材料在张应变作用下实现了很大的绝热温度变化。此外，相变温度可以通过外部应变来调节，作为相变温度。压缩应变降低了相变温度，而拉伸应变提高了相变温度。与电畴转变相关的巨大温度变化为利用应变来设计电畴结构提供了指导，从而优化了铁电材料在居里温度以下的电热性能。(C)2014 AIP出版有限责任公司。
The electrocaloric properties of multi-domain ferroelectrics are investigated using a phase field model. The simulation results show that the extrinsic contribution from the multi-domain to mono-domain transition driven by temperature significantly enhances the electrocaloric response. Due to the abrupt decrease of polarization in the direction of electric field during the domain transition, a large adiabatic temperature change is achieved for the ferroelectrics subjected to a tensile strain. Furthermore, the domain transition temperature can be tuned by external strains as the phase transition temperature. A compressive strain decreases the domain transition temperature while a tensile strain increases it. The large temperature change associated with the domain transition provides guidance to engineer domain structures by strain to optimize the electrocaloric properties of ferroelectric materials below the Curie temperature. (C) 2014 AIP Publishing LLC.