电热效应
铁电性
材料科学
相变
凝聚态物理
反铁电性
电场
铁电陶瓷
电介质
光电子学
物理
量子力学
作者
Junjie Li,Ruowei Yin,Yuxuan Hou,Xiaopo Su,Fangping Zhuo,Jianting Li,Xing Zhang,Wenjuan Wu,Lezhong Li,Yang Bai
摘要
Field-induced phase transition in antiferroelectric (AFE) materials always facilitates giant positive/negative electrocaloric (EC) responses for a promising cooling application, while it is not only associated with external field conditions but also applied field history, i.e., memory behavior. Herein, we demonstrate that memory behavior increases the likelihood of observing an EC response when the operating field is parallel to the pre-poling field, as compared to the antiparallel condition. Additionally, when the temperature is slightly above the AFE-ferroelectric (FE) phase transition temperature, the field-off process induces a two-step microstructure change, characterized by a rapid domain rotation followed by a slow phase transition, which finally produces an abnormal EC heat flow signal. Through a Landau theory analysis, this kinetic behavior is contributed to the competition between the ferroelectric (FE) order pinned by memory behavior and the thermal agitation favored AFE state. This work deepens the understanding of the phase transition in the ferroelectric system.
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