Large electrocaloric effect in tetragonal perovskite 0.03Bi(Mg1/2T1/2)O-3-0.97(0.875Bi(1/2)Na(1/2)TiO(3)-0.125BaTiO(3)) lead-free ferroelectric ceramics

作者：Yan, Xiaofen; Zhu, Mankang^*; Wei, Qiumei; Lu, Sheng-Guo^*; Zheng, Mupeng; Hou, Yudong

来源：Scripta Materialia, 2019, 162: 256-260.

DOI：10.1016/j.scriptamat.2018.11.007

• Lead-free ceramics
• Sodium bismuth titanate
• Electrocaloric effect
• Tetragonal perovskite

In this work, we reported a large electrocaloric effect (ECE) in tetragonal perovskite 0.03 Bi(Mg1/2Ti1/2)O-3-0.97 (0.875Bi(1/2)Na(1/2)TiO(3)-0.125BaTiO(3)) ceramic. It was found that the composition demonstrates a coexisting state of the ferroelectric P4mm and relaxor P4bm. Due to the field-induced phase transition from relaxor with P4bm symmetry to ferroelectric with P4mm symmetry, a positive ECE is observed in the temperature range of 25-130 degrees C. Under an electric field of 4 kV/mm, a large temperature change Delta T of 0.75 degrees C was achieved at 80 degrees C, and the EC responsivity Delta T-max/Delta E of 0.19 K.cm/kV, indicating a promising lead-free material for potential application in solid-state refrigerators.

• 出版日期2019-3-15
• 单位广东工业大学; 北京工业大学