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

doi:10.1088/1674-1056/abb230

Abstract The magnetocaloric effect of Mn, Ni, and Mn-Ni-doped EuTiO₃ compounds are studied in the near-liquid-helium-temperature range. The Eu(Ti_0.9375Mn_0.0625)O₃, Eu(Ti_0.975Ni_0.025)O₃, and Eu(Ti_0.9125Mn_0.0625Ni_0.025)O₃ are prepared by the sol-gel method. The Eu(Ti_0.9375Mn_0.0625)O₃ and Eu(Ti_0.9125Mn_0.0625Ni_0.025)O₃ exhibit ferromagnetism with second-order phase transition, and the Eu(Ti_0.975Ni_0.025)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(Ti_0.9375Mn_0.0625)O₃, Eu(Ti_0.975Ni_0.025)O₃, and Eu(Ti_0.9125Mn_0.0625Ni_0.025)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(Ti_0.9125Mn_0.0625Ni_0.025)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.

Keywords: magnetocaloric effect magnetic entropy change magnetic phase transformation

Received: 15 May 2020
Revised: 12 August 2020
Accepted manuscript online: 25 August 2020

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 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).

Corresponding Authors: ^†Corresponding author. E-mail: mzjmzj163@163.com ^‡Corresponding author. E-mail: jsen@mail.ipc.ac.cn

Cite this article:

Shuang Zeng(曾爽), Wen-Hao Jiang(姜文昊), Hui Yang(杨慧), Zhao-Jun Mo(莫兆军) Jun Shen(沈俊), and Lan Li(李岚) Improvement of the low-field-induced magnetocaloric effect in EuTiO₃ compounds 2020 Chin. Phys. B 29 127501

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

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Improvement of the low-field-induced magnetocaloric effect in EuTiO₃ compounds