Magnetic entropy change and magnetic phase transition of LaFe11.4Al1.6Cx (x=0--0.8) compounds

doi:10.1088/1009-1963/15/4/031

中国物理B ›› 2006, Vol. 15 ›› Issue (4): 845-849.doi: 10.1088/1009-1963/15/4/031

Magnetic entropy change and magnetic phase transition of LaFe_11.4Al_1.6C_x (x=0--0.8) compounds

张宏伟¹, 董巧燕¹, 张立刚², 汪汝武², 陈静³

(1)State Key Laboratory of Magnetism, Institute of Physics,Chinese Academy of Sciences, Beijing 100080, China; (2)Wuhan University of Science and Technology, Wuhan 430081, China; (3)Wuhan University of Science and Technology, Wuhan 430081, China;State Key Laboratory of Magnetism, Institute of Physics,Chinese Academy of Sciences, Beijing 100080, China

收稿日期:2005-11-24 修回日期:2005-11-30 出版日期:2006-04-20 发布日期:2006-04-20
基金资助:
Project supported by the State Key Program of Basic Research of China (Grant No 2006CB601101), and the National Natural Science Foundation of China ( Grant No 50271082).

Magnetic entropy change and magnetic phase transition of LaFe_11.4Al_1.6C_x (x=0--0.8) compounds

Chen Jing (陈静)^ab, Zhang Hong-Wei (张宏伟)^b, Zhang Li-Gang (张立刚)^a, Dong Qiao-Yan (董巧燕)^b, Wang Ru-Wu (汪汝武)^a

^a Wuhan University of Science and Technology, Wuhan 430081, China; ^b State Key Laboratory of Magnetism, Institute of Physics,Chinese Academy of Sciences, Beijing 100080, China

Received:2005-11-24 Revised:2005-11-30 Online:2006-04-20 Published:2006-04-20
Supported by:
Project supported by the State Key Program of Basic Research of China (Grant No 2006CB601101), and the National Natural Science Foundation of China ( Grant No 50271082).

摘要/Abstract

摘要： The unit cell volume and phase transition temperature of LaFe_11.4Al_1.6C_x compounds have been studied. The magnetic entropy change, refrigerant capacity and the type of magnetic phase transition are investigated in detail for LaFe_11.4Al_1.6C_x with x=0.1. All the LaFe_11.4Al_1.6C_x (x=0--0.8) compounds have the cubic NaZn₁₃-type structure. The addition of carbon atoms brings about a considerable increase in the lattice parameter. The bulk expansion results in the change of phase transition temperature ($T_{\rm c})$. T_c increases from 187\,K to 269\,K with x varying from 0.1 to 0.8. Meanwhile an increase in the lattice parameter can also cause a change of the magnetic ground state from antiferromagnetic to ferromagnetic. Large magnetic entropy change \vert \Delta S\vert is found over a large temperature range around T_c and the refrigerant capacity is about 322J/kg for LaFe_11.4Al_1.6C_0.1. The magnetic phase transition belongs in weakly first-order one for x=0.1.

关键词: LaFe_11.4Al_1.6C_x compounds, magnetic phase transition, magnetic entropy change, refrigerant capacity

Abstract: The unit cell volume and phase transition temperature of LaFe_11.4Al_1.6C_x compounds have been studied. The magnetic entropy change, refrigerant capacity and the type of magnetic phase transition are investigated in detail for LaFe_11.4Al_1.6C_x with x=0.1. All the LaFe_11.4Al_1.6C_x (x=0--0.8) compounds have the cubic NaZn₁₃-type structure. The addition of carbon atoms brings about a considerable increase in the lattice parameter. The bulk expansion results in the change of phase transition temperature ($T_{\rm c})$. $T_{\rm c}$ increases from 187 K to 269 K with x varying from 0.1 to 0.8. Meanwhile an increase in the lattice parameter can also cause a change of the magnetic ground state from antiferromagnetic to ferromagnetic. Large magnetic entropy change $\vert \Delta S\vert$ is found over a large temperature range around T_c and the refrigerant capacity is about 322J/kg for LaFe_11.4Al_1.6C_0.1. The magnetic phase transition belongs in weakly first-order one for x=0.1.

Key words: LaFe_11.4Al_1.6C_x compounds, magnetic phase transition, magnetic entropy change, refrigerant capacity

中图分类号: (Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.))

75.30.Kz

61.66.Fn (Inorganic compounds) 65.40.G- (Other thermodynamical quantities) 75.30.Sg (Magnetocaloric effect, magnetic cooling)

陈静, 张宏伟, 张立刚, 董巧燕, 汪汝武. Magnetic entropy change and magnetic phase transition of LaFe_11.4Al_1.6C_x (x=0--0.8) compounds[J]. 中国物理B, 2006, 15(4): 845-849.

Chen Jing (陈静), Zhang Hong-Wei (张宏伟), Zhang Li-Gang (张立刚), Dong Qiao-Yan (董巧燕), Wang Ru-Wu (汪汝武). Magnetic entropy change and magnetic phase transition of LaFe_11.4Al_1.6C_x (x=0--0.8) compounds[J]. Chinese Physics, 2006, 15(4): 845-849.

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Magnetic entropy change and magnetic phase transition of LaFe_11.4Al_1.6C_x (x=0--0.8) compounds

Magnetic entropy change and magnetic phase transition of LaFe_11.4Al_1.6C_x (x=0--0.8) compounds

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