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

中国物理B ›› 2020, Vol. 29 ›› Issue (3): 37502-037502.doi: 10.1088/1674-1056/ab69e7

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇下一篇

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

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)

1 School of Material Science and Engineering, Institute of Material Physics, Key Laboratory of Display Materials and Photoelectric Devices of Ministry of Education, Key Laboratory for Optoelectronic Materials and Devices of Tianjin, Tianjin University of Technology, Tianjin 300191, China;
2 Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China;
3 School of Material Science and Engineering, Hebei University of Technology, Tianjin 300401, China

收稿日期:2019-10-14 修回日期:2020-01-02 出版日期:2020-03-05 发布日期:2020-03-05
通讯作者: Zhao-Jun Mo, Lan Li E-mail:mzjmzj163@163.com;lilan@tjut.edu.cn
基金资助:
Project supported by the Science & Technology Development Fund of Tianjin Education Commission for Higher Education, China (Grant No. 2017KJ247).

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

Wen-Hao Jiang(姜文昊)¹, Zhao-Jun Mo(莫兆军)¹, Jia-Wei Luo(罗佳薇)¹, Zhe-Xuan Zheng(郑哲轩)¹, Qiu-Jie Lu(卢秋杰)¹, Guo-Dong Liu(刘国栋)³, Jun Shen(沈俊)², Lan Li(李岚)¹

1 School of Material Science and Engineering, Institute of Material Physics, Key Laboratory of Display Materials and Photoelectric Devices of Ministry of Education, Key Laboratory for Optoelectronic Materials and Devices of Tianjin, Tianjin University of Technology, Tianjin 300191, China;
2 Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China;
3 School of Material Science and Engineering, Hebei University of Technology, Tianjin 300401, China

Received:2019-10-14 Revised:2020-01-02 Online:2020-03-05 Published:2020-03-05
Contact: Zhao-Jun Mo, Lan Li E-mail:mzjmzj163@163.com;lilan@tjut.edu.cn
Supported by:
Project supported by the Science & Technology Development Fund of Tianjin Education Commission for Higher Education, China (Grant No. 2017KJ247).

摘要/Abstract

摘要： 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.

关键词: magnetocaloric effect, magnetic entropy change, magnetic phase transformation

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.

Key words: magnetocaloric effect, magnetic entropy change, magnetic phase transformation

中图分类号: (Magnetocaloric effect, magnetic cooling)

75.30.Sg

65.40.gd (Entropy) 75.30.Kz (Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.))

姜文昊, 莫兆军, 罗佳薇, 郑哲轩, 卢秋杰, 刘国栋, 沈俊, 李岚. Giant low-field magnetocaloric effect in EuTi_1-xNb_xO₃ (x=0.05, 0.1, 0.15, and 0.2) compounds[J]. 中国物理B, 2020, 29(3): 37502-037502.

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[J]. Chin. Phys. B, 2020, 29(3): 37502-037502.

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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

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

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