Enhanced electrocaloric effect at room temperature in Mn2+ doped lead-free (BaSr)TiO3 ceramics via a direct measurement

Journal of Advanced Ceramics

Haoxuan Li¹  Xiang Niu¹  Wei Liang¹  Xiaodong Jian²  Tao Tao²  Bo Liang²  Sheng-Guo Lu²  Xianyi Chen²  Yingbang Yao² 

[1] Guangdong Provincial Research Center on Smart Materials and Energy Conversion Devices, Guangdong Provincial Key Laboratory of Functional Soft Condensed Matter, School of Materials and Energy, Guangdong University of Technology, 510006, Guangzhou, China;Guangdong Provincial Research Center on Smart Materials and Energy Conversion Devices, Guangdong Provincial Key Laboratory of Functional Soft Condensed Matter, School of Materials and Energy, Guangdong University of Technology, 510006, Guangzhou, China;Dongguan South China Design Innovation Institute, 523808, Dongguan, China;

关键词: barium strontium titanate ceramics;    permittivity;    dielectric loss;    electrocaloric effect;    electrocaloric strength;   

DOI  :  10.1007/s40145-020-0450-1

来源: Springer

【 摘 要 】

(Ba1−xSrx)(MnyTi1−y)O3 (BSMT) ceramics with x = 35, 40 mol% and y = 0, 0.1, 0.2, 0.3, 0.4, 0.5 mol% were prepared using a conventional solid-state reaction approach. The dielectric and ferroelectric properties were characterized using impedance analysis and polarization-electric field (P–E) hysteresis loop measurements, respectively. The adiabatic temperature drop was directly measured using a thermocouple when the applied electric field was removed. The results indicate that high permittivity and low dielectric losses were obtained by doping 0.1–0.4 mol% of manganese ions in (BaSr)TiO3 (BST) specimens. A maximum electrocaloric effect (ECE) of 2.75 K in temperature change with electrocaloric strength of 0.55 K·(MV/m)−1 was directly obtained at ∼21 °C and 50 kV/cm in Ba0.6Sr0.4Mn0.001Ti0.999O3 sample, offering a promising ECE material for practical refrigeration devices working at room temperature.

【 授权许可】

CC BY