电热效应
铁电性
材料科学
凝聚态物理
光电子学
物理
电介质
作者
Hua Feng,Ming Hao,Guanghua Wu,Ying Zheng,Lishun Yang,Dage Liu,Yijiang Zhao,Xiaoyan Liu,Haibo Zhang,Gang Liu
摘要
Abstract A large adiabatic temperature change along with a wide operating temperature region is usually required for the electrocaloric materials to fulfill their refrigeration function. In general, doping foreign ions into BaTiO 3 is the frequently utilized strategy in order to obtain excellent electrocaloric materials for the practical application. In the current paper, BaTiO 3 lead‐free ferroelectric ceramics were doped by Ca 2+ and Sn 4+ simultaneously in order to generate a coexistence state at room temperature, where ferroelectric domains and nanodomains exit. As a result, a large polarization and a wide operating temperature range were finally induced. It is found that Ba 0.9 Ca 0.1 Ti 0.85 Sn 0.15 O 3 has a maximum adiabatic temperature change of 0.85 K and an excellent working temperature region (65 K, ∆ T > 90% T max ) was achieved under an electric field of 50 kV/cm. The above phenomenon indicates that the modified BaTiO 3 ceramics can be a good potential electrocaloric material in the state of cross‐existence of ferroelectric domains and nanodomains.
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