Giant low-field magnetocaloric effect in EuTi1-xNbxO3 (x=0.05, 0.1, 0.15, and 0.2) compounds

doi:10.1088/1674-1056/ab69e7

Abstract The magnetic properties and magnetocaloric effect (MCE) of EuTi_1-xNb_xO₃ (x=0.05, 0.1, 0.15, and 0.2) compounds are investigated. Owing to electronic doping, parts of Ti ions are replaced by Nb ions, the lattice constant increases and a small number of Ti⁴⁺ (3d⁰) ions change into Ti³⁺ (3d¹). It is the ferromagnetism state that is dominant in the derivative balance. The values of the maximum magnetic entropy change (-ΔS_M^max) are 10.3 J/kg·K, 9.6 J/kg·K, 13.1 J/kg·K, and 11.9 J/kg·K for EuTi_1-xNb_xO₃ (x=0.05, 0.1, 0.15, and 0.2) compounds and the values of refrigeration capacity are 36, 33, 86, and 80 J/kg as magnetic field changes in a range of 0 T-1 T. The EuTi_1-xNb_xO₃ (x=0.05, 0.1, 0.15, and 0.2) compounds with giant reversible MCE are considered as a good candidate for magnetic refrigerant working at low-temperature and low-field.

Keywords: magnetocaloric effect magnetic entropy change magnetic phase transformation

Received: 14 October 2019
Revised: 02 January 2020
Accepted manuscript online:

PACS:	75.30.Sg	(Magnetocaloric effect, magnetic cooling)
	65.40.gd	(Entropy)
	75.30.Kz	(Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.))

Fund: Project supported by the Science & Technology Development Fund of Tianjin Education Commission for Higher Education, China (Grant No. 2017KJ247).

Corresponding Authors: Zhao-Jun Mo, Lan Li
E-mail: mzjmzj163@163.com;lilan@tjut.edu.cn

Cite this article:

Wen-Hao Jiang(姜文昊), Zhao-Jun Mo(莫兆军), Jia-Wei Luo(罗佳薇), Zhe-Xuan Zheng(郑哲轩), Qiu-Jie Lu(卢秋杰), Guo-Dong Liu(刘国栋), Jun Shen(沈俊), Lan Li(李岚) Giant low-field magnetocaloric effect in EuTi_1-xNb_xO₃ (x=0.05, 0.1, 0.15, and 0.2) compounds 2020 Chin. Phys. B 29 037502

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Giant low-field magnetocaloric effect in EuTi1-xNbxO3 (x=0.05, 0.1, 0.15, and 0.2) compounds

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Giant low-field magnetocaloric effect in EuTi_1-xNb_xO₃ (x=0.05, 0.1, 0.15, and 0.2) compounds