| Influence of Sn substitution for Co in RCo2 （R = Gd, Tb, Dy） alloys on the structure and magnetocaloric effect |
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| 摘 要： | The phases and the magnetocaloric effect in the alloys R(Co1-xSnx)2 with x=0, 0.025, 0.050, 0.075, and 0.100 were investigated by X-ray diffraction analysis and magnetization measurement. The substitution of Sn in RCo2 is limited. The cubic MgCu2-type structure for the alloys of RCo2 was confirmed by X-ray powder diffraction and the remaining alloys mainly consisted of the RCo2 phase, along with some RCo3 and R5Sn3 impurity phases. The impurity phases increase with the increase of Sn content. The Tc of the alloys is not very sensitive to the Sn substitution for Dy(Co1-xSnx)2 and Tb(Co1-xSnx)2, whereas in Gd(Co1-xSnx)2, the Curie temperatures significantly increase. The maximum magnetic entropy changes in the alloys Dy(Co1-xSnx)2 (x=0,0.025, 0.050, 0.075) are 5.78, 5.43, 3.88, and 2.98 J·kg-1·K-1, respectively, and those in the Tb(Co1-xSnx)2 (x =0,0.025) are 3.44, and 2.29 J·kg-1·K-1 respectively in the applied field change of 0-2.0 T.
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| 关 键 词： | 稀土化合物 钴合金 锡 材料替代 结构 磁致热效应 磁致冷材料 |
| 收稿时间： | 2005-12-26 |
Influence of Sn substitution for Co in RCo2 (R = Gd, Tb, Dy) alloys on the structure and magnetocaloric effect |
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| ZHUANG Yinghong,DENG Jianqiu,LI Junqin,ZHAN Yongzhong,ZHU Qiming,ZHOU Kaiwen. Influence of Sn substitution for Co in RCo2 (R = Gd, Tb, Dy) alloys on the structure and magnetocaloric effect[J]. Rare Metals, 2007, 26(2): 97-102. DOI: 10.1016/S1001-0521(07)60167-3 |
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| Authors: | ZHUANG Yinghong DENG Jianqiu LI Junqin ZHAN Yongzhong ZHU Qiming ZHOU Kaiwen |
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| Affiliation: | 1. Frontier Institute of Science and Technology, State Key Laboratory for Mechanical Behaviour of Materials, Xi''an Jiaotong University, Xi''an 710049, China;2. MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, Xi''an Jiaotong University, Xi''an 710049, China;3. Center for Functional Materials, National Institute for Materials Science, Tsukuba 305-0047, Ibaraki, Japan |
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| Abstract: | The phases and the magnetocaloric effect in the alloys R(Co1-xSnx)2 with x = 0, 0.025, 0.050, 0.075, and 0.100 were investigated by X-ray diffraction analysis and magnetization measurement. The substitution of Sn in RCo2 is limited.The cubic MgCu2-type structure for the alloys of RCo2 was confirmed by X-ray powder diffraction and the remaining alloys mainly consisted of the RCo2 phase, along with some RCo3 and R5Sn3 impurity phases. The impurity phases increase with the increase of Sn content. The Tc of the alloys is not very sensitive to the Sn substitution for Dy(Co1-xSnx)2 and Th(Co1-xSnx)2, whereas in Gd(Co1-xSnx)2, the Curie temperatures significantly increase. The maximum magnetic entropy changes in the alloys Dy(Co1-xSnx)2 (x = 0, 0.025, 0.050, 0.075) are 5.78, 5.43, 3.88, and 2.98 J·kg-1·K-1, respectively, and those in the Tb(Co1-xSnx)2 (x = 0, 0.025) are 3.44, and 2.29 J·kg-1·K-1 respectively in the applied field change of 0-2.0 T. |
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| Keywords: | magnetic refrigeration materials magnetocaloric effect magnetization rare earth compounds |
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