| Magnetic properties and magnetocaloric effects in NaZn13-type La（Fe, Al）13-based compounds |
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| 引用本文： | 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. |
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| 作者姓名： | 沈保根 胡凤霞 董巧燕 孙继荣 |
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| 作者单位： | State Key Laboratory for Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China |
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| 基金项目： | Project supported by the National Natural Science Foundation of China;the Key Research Program of the Chinese Academy of Sciences;the National Basic Research Program of China;the National High Technology Research and Development Program of China |
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| 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 LaFe13-xAlx 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-xAlx 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 LaFe13-xAlx 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 11.5Al1.5C0.2H1.0 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.
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| 关 键 词： | 反铁磁性 磁热效应 化合物 磁特性 铝含量 室温磁制冷 LA 转变温度 |
| 收稿时间： | 2012-11-28 |
Magnetic properties and magnetocaloric effects in NaZn13-type La(Fe,Al)13-based compounds |
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| Shen Bao-Gen,Hu Feng-Xia,Dong Qiao-Yan,and Sun Ji-Rong.Magnetic properties and magnetocaloric effects in NaZn13-type La(Fe,Al)13-based compounds[J].Chinese Physics B,2013,22(1):17502-017502. |
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| Authors: | Shen Bao-Gen Hu Feng-Xia Dong Qiao-Yan and Sun Ji-Rong |
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| Affiliation: | State Key Laboratory for Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China |
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| 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 LaFe13-xAlx 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 LaFe13-xAlx 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 LaFe13-xAlx 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 LaFe11.5Al1.5C0.2H1.0 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. |
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| Keywords: | La(Fe Al)13 compounds magnetocaloric effect magnetic entropy change magnetic phase transition |
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