| Magnetic entropy change and magnetic phase transition of LaFe11.4Al1.6Cx （x=0-0.8） compounds |
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| 引用本文： | 陈静,张宏伟,张立刚,董巧燕,汪汝武.Magnetic entropy change and magnetic phase transition of LaFe11.4Al1.6Cx （x=0-0.8） compounds[J].中国物理 B,2006,15(4):845-849. |
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| 作者姓名： | 陈静 张宏伟 张立刚 董巧燕 汪汝武 |
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| 作者单位： | Wuhan University of Science and Technology, Wuhan 430081, China;State Key Laboratory of Magnetism, Institute of Physics,Chinese Academy of Sciences, Beijing 100080, China;State Key Laboratory of Magnetism, Institute of Physics,Chinese Academy of Sciences, Beijing 100080, China;Wuhan University of Science and Technology, Wuhan 430081, China;State Key Laboratory of Magnetism, Institute of Physics,Chinese Academy of Sciences, Beijing 100080, China;Wuhan University of Science and Technology, Wuhan 430081, China |
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| 基金项目： | 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). |
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| 摘 要： | The unit cell volume and phase transition temperature of LaFe11.4Al1.6Cx compounds have been studied. The magnetic entropy change, refrigerant capacity and the type of magnetic phase transition are investigated in detail for LaFe11.4Al1.6Cx with x=0.1, All the LaFe11.4Al1.6Cx （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 （Tc）, Tc increases from 187K 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 IASI is found over a large temperature range around Tc and the refrigerant capacity is about 322J/kg for LaFe11.4Al1.6C0.1. The magnetic phase transition belongs in weakly first-order one for x=0.1.
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| 关 键 词： | LaFe11.4Al1.6Cx化合物 磁相跃迁 磁熵转变 制冷容量 |
| 收稿时间： | 2005-11-24 |
| 修稿时间： | 2005-11-242005-11-30 |
Magnetic entropy change and magnetic phase transition of LaFe11.4Al1.6Cx (x=0--0.8) compounds |
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| Chen Jing,Zhang Hong-Wei,Zhang Li-Gang,Dong Qiao-Yan and Wang Ru-Wu.Magnetic entropy change and magnetic phase transition of LaFe11.4Al1.6Cx (x=0--0.8) compounds[J].Chinese Physics B,2006,15(4):845-849. |
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| Authors: | Chen Jing Zhang Hong-Wei Zhang Li-Gang Dong Qiao-Yan and Wang Ru-Wu |
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| Institution: | State Key Laboratory of Magnetism, Institute of Physics,Chinese Academy of Sciences, Beijing 100080, China; Wuhan University of Science and Technology, Wuhan 430081, China; Wuhan University of Science and Technology, Wuhan 430081, China;State Key Laboratory of Magnetism, Institute of Physics,Chinese Academy of Sciences, Beijing 100080, China |
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| Abstract: | The unit cell volume and phase transition temperature of
LaFe11.4Al1.6Cx compounds have been studied. The
magnetic entropy change, refrigerant capacity and the type of magnetic
phase transition are investigated in
detail for LaFe11.4Al1.6Cx with x=0.1. All the
LaFe11.4Al1.6Cx (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 ($T_{\rm c})$.
Tc 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 Tc and the refrigerant
capacity is about 322J/kg for LaFe11.4Al1.6C0.1.
The magnetic phase transition belongs in weakly first-order one for x=0.1. |
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| Keywords: | LaFe11 4Al1 6Cx compounds magnetic phase transition magnetic entropy change refrigerant capacity |
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