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
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 ($T_{\rm c})$. $T_{\rm c}$ 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 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.
Received: 24 November 2005
Revised: 30 November 2005
Accepted manuscript online:
PACS:
75.30.Kz
(Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.))
Fund: 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).
Cite this article:
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 LaFe11.4Al1.6Cx (x=0--0.8) compounds 2006 Chinese Physics 15 845
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