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(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 (PE) 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.


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

Show Author's information Xiang NIUaXiaodong JIANa,bXianyi CHENa,bHaoxuan LIaWei LIANGaYingbang YAOa,bTao TAOa,bBo LIANGa,bSheng-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.

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 (PE) 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 ceramics, permittivity, dielectric loss, electrocaloric effect, electrocaloric strength
Received: 25 August 2020 Revised: 24 November 2020 Accepted: 24 December 2020 Published: 15 April 2021 Issue date: June 2021
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Publication history

Received: 25 August 2020
Revised: 24 November 2020
Accepted: 24 December 2020
Published: 15 April 2021
Issue date: June 2021

Copyright

© The Author(s) 2020

Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant Nos. 51372042 and 51872053), the Guangdong Provincial Natural Science Foundation (Grant No. 2015A030308004), the NSFC– Guangdong Joint Fund (Grant No. U1501246), the Dongguan City Frontier Research Project (Grant No. 2019622101006), and the Advanced Energy Science and Technology Guangdong Provincial Laboratory Foshan Branch-Foshan Xianhu Laboratory Open Fund-Key Project (Grant No. XHT2020-011).

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