Abstract Magnetism and magnetic entropy changes in LaFe$_{11}$Al$_2$C$_x$ ($x$=0.0, 0.2 and 0.5) compounds have been investigated. The Curie temperature $T_{\rm C}$ is conveniently controlled from 200K to room temperature by varying the carbon concentration. Large magnetic entropy change is obtained over a wide temperature range due to the high magnetization and the drastic decrease in the magnetization around $T_{\rm C}$. The large magnetic entropy change in wide temperature range, low cost and the convenience of controlling $T_{\rm C}$ suggest that the LaFe$_{11}$Al$_2$C$_x$ compounds are promising candidates for magnetic refrigerants in the corresponding temperature range.
Received: 28 July 2003
Revised: 11 August 2003
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 Development Program for Basic Research of China (973) (Grant No G1998061303), by the National High Technology Development Program of China (Grant No 2002A A324010), and by the National Natural Science Foundation of China
Cite this article:
Wang Fang (王芳), Chen Yuan-Fu (陈远富), Wang Guang-Jun (王光军), Sun Ji-Rong (孙继荣), Shen Bao-Gen (沈保根) Magnetism and magnetic entropy change in LaFe11Al2Cx compounds around room temperature 2004 Chinese Physics 13 393
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