Near-Room-Temperature Large Electrocaloric Effect in Barium Titanate Single Crystal Based on the Electric Field–Temperature Phase Diagram,Physica Status Solidi-Rapid Research Letters

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Near-Room-Temperature Large Electrocaloric Effect in Barium Titanate Single Crystal Based on the Electric Field–Temperature Phase Diagram
Physica Status Solidi-Rapid Research Letters ( IF 2.5 ) Pub Date : 2021-06-22 , DOI: 10.1002/pssr.202100251
Junjie Li ₁ , Zhonghua Li ₁ , Jingjin He ₁ , Yuxuan Hou ₁ , Yanjing Su ₁ , Lijie Qiao ₁ , Yang Bai ₁

Affiliation

Phase transition plays a key role in the electrocaloric effect, but the first-order ferroelectric–paraelectric phase transition always occurs far above room temperature, which heavily limits the practical application. Herein, the focus is on the orthorhombic–tetragonal first-order ferroelectric–ferroelectric phase transition (@288 K) in <011>-oriented barium titanate single crystal. Ferroelectric properties under a high electric field indicate a reversible field-induced tetragonal–orthorhombic phase transition, based on which the electric field–temperature phase diagram is established. It is strongly related to the enhanced electrocaloric effect, and a large adiabatic temperature change of 1.33 K is obtained at 288 K under 15 kV cm⁻¹, that is, a high electrocaloric strength of 88.7 mK cm kV⁻¹. The large electrocaloric effect near room temperature makes lead-free BaTiO₃ a promising candidate for next-generation solid-state refrigeration.

中文翻译：

基于电场-温度相图的钛酸钡单晶近室温大电热效应

相变在电热效应中起关键作用，但一阶铁电-顺电相变总是发生在远高于室温的温度，这严重限制了实际应用。在此，重点是 <011> 取向的钛酸钡单晶中正交-四方一阶铁电-铁电相变（@288 K）。高电场下的铁电特性表明可逆场诱导的四方-正交相变，基于该相变建立电场-温度相图。这与增强的电热效应密切相关，在15 kV cm ^-1下288 K获得了1.33 K的大绝热温度变化，即88.7 mK cm kV ^-1的高电热强度. 室温附近的大电热效应使无铅 BaTiO ₃成为下一代固态制冷的有希望的候选者。

更新日期：2021-08-15

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