中国物理B ›› 2020, Vol. 29 ›› Issue (12): 127501-.doi: 10.1088/1674-1056/abb230

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  • 收稿日期:2020-05-15 修回日期:2020-08-12 接受日期:2020-08-25 出版日期:2020-12-01 发布日期:2020-11-26

Improvement of the low-field-induced magnetocaloric effect in EuTiO 3 compounds

Shuang Zeng(曾爽)1, Wen-Hao Jiang(姜文昊)1, Hui Yang(杨慧)1, Zhao-Jun Mo(莫兆军)1,† Jun Shen(沈俊)2,‡, and Lan Li(李岚) 1   

  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
  • Received:2020-05-15 Revised:2020-08-12 Accepted:2020-08-25 Online:2020-12-01 Published:2020-11-26
  • Contact: Corresponding author. E-mail: mzjmzj163@163.com Corresponding author. E-mail: jsen@mail.ipc.ac.cn
  • Supported by:
    Project supported by the National Key Research and Development Program of China (Grant No. 2017YFB0702704), the National Natural Science Foundation of China (Grant Nos. 11504266 and 51676198), the Tianjin Natural Science Foundation, China (Grant No. 17JCQNJC02300), and the Science & Technology Development Fund of Tianjin Education Commission for Higher Education, China (Grant No. 2017KJ247).

Abstract: The magnetocaloric effect of Mn, Ni, and Mn-Ni-doped EuTiO3 compounds are studied in the near-liquid-helium-temperature range. The Eu(Ti0.9375Mn0.0625)O3, Eu(Ti0.975Ni0.025)O3, and Eu(Ti0.9125Mn0.0625Ni0.025)O3 are prepared by the sol-gel method. The Eu(Ti0.9375Mn0.0625)O3 and Eu(Ti0.9125Mn0.0625Ni0.025)O3 exhibit ferromagnetism with second-order phase transition, and the Eu(Ti0.975Ni0.025)O3 displays antiferromagnetic behavior. Under the magnetic field change of 10 kOe (1 Oe=79.5775 Am-1), the values of magnetic entropy change are 8.8 Jkg-1K-1, 12 Jkg-1K-1, and 10.9 Jkg-1K-1 for Eu(Ti0.9375Mn0.0625)O3, Eu(Ti0.975Ni0.025)O3, and Eu(Ti0.9125Mn0.0625Ni0.025)O3, respectively. The co-substitution of Mn and Ni can not only improve the magnetic entropy change, but also widen the refrigeration temperature window, which greatly enhances the magnetic refrigeration capacity. Under the magnetic field change of 10 kOe, the refrigerant capacity value of Eu(Ti0.9125Mn0.0625Ni0.025)O3 is 62.6 Jkg-1 more than twice that of EuTiO3 (27 Jkg-1), indicating that multi-component substitution can lead to better magnetocaloric performance.

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.))