材料科学
电热效应
反铁电性
双层
铁电性
异质结
电场
绝热过程
相变
光电子学
热电性
凝聚态物理
电介质
热力学
物理
生物
量子力学
遗传学
膜
作者
Wenyue Zhao,Ze Li,Zhao Wang,Yazhou Peng,Lei Shi,Wenjing Hua,Jie Wang,Lidong Wang,Weidong Fei,Yu Zhao
出处
期刊:Acta Materialia
[Elsevier]
日期:2023-08-01
卷期号:254: 118989-118989
被引量:1
标识
DOI:10.1016/j.actamat.2023.118989
摘要
Electrocaloric effects of antiferroelectric and ferroelectric films have been intensively studied for the applications in refrigeration. However, achieving high electrocaloric performance near room temperature is still very difficult in films. Herein, we report that large and regulable electrocaloric effects at room temperature are achieved in PbZrO3/Ca3Mn2O7 bilayer films based on PbZrO3 phase transition, and the sign of adiabatic temperature change, ΔT, is determined by Ca3Mn2O7 thickness. The PbZrO3-Ca3Mn2O7 heterojunction formed by carrier diffusions reduces the carrier concentration of the film and establishes a built-in electric field in the junction region, and withstanding voltages of the bilayer films are enhanced greatly. The maximum positive ΔT of 66.5 K was obtained in the bilayer film with a thin Ca3Mn2O7 layer, but a negative ΔT of -9.9 K with a thick Ca3Mn2O7 layer, near room temperature. This work presents a simple and effective approach to designing huge electrocaloric based on antiferroelectric-containing multilayers near room temperature.
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