| Magnetocaloric effect in ErCo2 compound |
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| 作者姓名： | 邹君鼎 沈保根 孙继荣 |
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| 作者单位： | State Key Laboratory for Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100080,
China;State Key Laboratory for Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100080,
China;State Key Laboratory for Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100080,
China |
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| 基金项目： | Project supported by the National Natural Science Foundation of China
(Grant No~50571112) and the National Basic Research Program of China (Grant
No~2006CB601101). |
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| 摘 要： | The ErCo2 compound is prepared by arc-melting and its entropy changes are calculated using Maxwell relation. Its entropy change reaches 38 J/（kg·K） and its refrigerant capacity achieves 291 J/kg at 0-5 T. The mean field approximation is used to calculate the magnetic entropy of ErCo2 compound. Results estimated by using the Maxwell relation deviate from mean field approximation calculations in ferrimagnetic state; however, the data obtained by the two ways are consistent in the vicinity of phase transition or at higher temperatures. This indicates that entropy changes are mainly derived from magnetic degree of freedom, and the lattice has almost no contribution to the entropy change in the vicinity of phase transition but its influence is obvious in the ferrimagnetic state below TC.
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| 关 键 词： | 磁热效果 钴铒化合物 金属磁铁 物理 |
| 收稿时间： | 3/2/2007 12:00:00 AM |
| 修稿时间： | 2007-03-022007-03-23 |
Magnetocaloric effect in ErCo2 compound |
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| Zou Jun-Ding,Shen Bao-Gen and Sun Ji-Rong.Magnetocaloric effect in ErCo2 compound[J].Chinese Physics B,2007,16(7):1817-1821. |
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| Authors: | Zou Jun-Ding Shen Bao-Gen and Sun Ji-Rong |
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| Institution: | State Key Laboratory for Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China |
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| Abstract: | The ErCo 2 compound is prepared by arc-melting and its entropy changes
are calculated using Maxwell relation. Its entropy change reaches
38~J/(kg \cdot K)
and its refrigerant capacity achieves 291 J/kg at 0--5 T. The mean field
approximation is used to calculate the magnetic entropy of ErCo 2
compound. Results estimated by using the Maxwell relation deviate from mean
field approximation calculations in ferrimagnetic state; however, the data
obtained by the two ways are consistent in the vicinity of phase transition
or at higher temperatures. This indicates that entropy changes are mainly
derived from magnetic degree of freedom, and the lattice has almost no
contribution to the entropy change in the vicinity of phase transition but
its influence is obvious in the ferrimagnetic state below TC. |
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| Keywords: | magnetocaloric effect mean field approximation metamagnetic transition |
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