Magnetic properties and magnetocaloric effects in NaZn13-type La(Fe, Al)13-based compounds

doi:10.1088/1674-1056/22/1/017502

摘要/Abstract

摘要： In this article, our recent progress concerning the effects of atomic substitution, magnetic field, and temperature on the magnetic and magnetocaloric properties of the LaFe_13-xAl_x compounds are reviewed. With an increase of the aluminum content, the compounds exhibit successively an antiferromagnetic (AFM) state, a ferromagnetic (FM) state, and a mictomagnetic state. Furthermore, the AFM coupling of LaFe_13-xAl_x can be converted to an FM one by substituting Si for Al, Co for Fe, and magnetic rare-earth R for La, or introducing interstitial C or H atoms. However, low doping levels lead to FM clusters embedded in an AFM matrix, and the resultant compounds can undergo, under appropriate applied fields, first an AFM-FM and then an FM-AFM phase transition while heated, with significant magnetic relaxation in the vicinity of the transition temperature. The Curie temperature of LaFe_13-xAl_x can be shifted to room temperature by choosing appropriate contents of Co, C, or H, and a strong magnetocaloric effect can be obtained around the transition temperature. For example, for the LaFe_11.5Al_1.5C_0.2H_1.0 compound, the maximal entropy change reaches 13.8 J·kg^-1·K^-1 for a field change of 0-5 T, occurring around room temperature. It is 42% higher than that of Gd, and therefore, this compound is a promising room-temperature magnetic refrigerant.

关键词: La(Fe,Al)₁₃ compounds, magnetocaloric effect, magnetic entropy change, magnetic phase transition

Abstract: In this article, our recent progress concerning the effects of atomic substitution, magnetic field, and temperature on the magnetic and magnetocaloric properties of the LaFe_13-xAl_x compounds are reviewed. With an increase of the aluminum content, the compounds exhibit successively an antiferromagnetic (AFM) state, a ferromagnetic (FM) state, and a mictomagnetic state. Furthermore, the AFM coupling of LaFe_13-xAl_x can be converted to an FM one by substituting Si for Al, Co for Fe, and magnetic rare-earth R for La, or introducing interstitial C or H atoms. However, low doping levels lead to FM clusters embedded in an AFM matrix, and the resultant compounds can undergo, under appropriate applied fields, first an AFM-FM and then an FM-AFM phase transition while heated, with significant magnetic relaxation in the vicinity of the transition temperature. The Curie temperature of LaFe_13-xAl_x can be shifted to room temperature by choosing appropriate contents of Co, C, or H, and a strong magnetocaloric effect can be obtained around the transition temperature. For example, for the LaFe_11.5Al_1.5C_0.2H_1.0 compound, the maximal entropy change reaches 13.8 J·kg^-1·K^-1 for a field change of 0-5 T, occurring around room temperature. It is 42% higher than that of Gd, and therefore, this compound is a promising room-temperature magnetic refrigerant.

Key words: La(Fe,Al)₁₃ compounds, magnetocaloric effect, magnetic entropy change, magnetic phase transition

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

75.30.Sg

75.50.Bb (Fe and its alloys)

沈保根, 胡凤霞, 董巧燕, 孙继荣. Magnetic properties and magnetocaloric effects in NaZn₁₃-type La(Fe, Al)₁₃-based compounds[J]. 中国物理B, 2013, 22(1): 17502-017502.

Shen Bao-Gen (沈保根), Hu Feng-Xia (胡凤霞), Dong Qiao-Yan (董巧燕), Sun Ji-Rong (孙继荣). Magnetic properties and magnetocaloric effects in NaZn₁₃-type La(Fe, Al)₁₃-based compounds[J]. Chin. Phys. B, 2013, 22(1): 17502-017502.

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Magnetic properties and magnetocaloric effects in NaZn₁₃-type La(Fe, Al)₁₃-based compounds

Magnetic properties and magnetocaloric effects in NaZn₁₃-type La(Fe, Al)₁₃-based compounds

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