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Research Article | Open Access

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

Xiang NIUa,†, Xiaodong JIANa,b,†, Xianyi CHENa,b, Haoxuan LIa, Wei LIANGa, Yingbang YAOa,b, Tao TAOa,b, Bo LIANGa,b, Sheng-Guo LUa,b( )
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, Guangzhou 510006, China
Dongguan South China Design Innovation Institute, Dongguan 523808, China

† Xiang Niu and Xiaodong Jian contributed equally to this work.

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Abstract

(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 ℃ and 50 kV/cm in Ba0.6Sr0.4Mn0.001Ti0.999O3 sample, offering a promising ECE material for practical refrigeration devices working at room temperature.

Keywords

barium strontium titanate ceramicspermittivitydielectric losselectrocaloric effectelectrocaloric strength

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Journal of Advanced Ceramics
Volume 10 Issue 3,
June 2021
Pages 482-492
DOI: 10.1007/s40145-020-0450-1
Cite this article:
NIU X, JIAN X, CHEN X, et al. Enhanced electrocaloric effect at room temperature in Mn2+ doped lead-free (BaSr)TiO3 ceramics via a direct measurement. Journal of Advanced Ceramics, 2021, 10(3): 482-492. https://doi.org/10.1007/s40145-020-0450-1

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Received: 25 August 2020
Revised: 24 November 2020
Accepted: 24 December 2020
Published: 15 April 2021
© The Author(s) 2020

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