Magnetocaloric effect of (Tb_(1-x)Ce_x)Co_2 alloys in low magnetic field
来源期刊：JOURNAL OF RARE EARTHS2009年第6期
论文作者：ZHUANG Yinghong CHEN Xiang
Key words：RECo_2 alloy; crystal structure; magnetocaloric effect; X-ray diffraction; rare earths;
Abstract: The phases in alloys (Tb_(1-x)Ce_x)Co_2 with x=0, 0.1, 0.2, 0.3, 0.4 and 0.5 were investigated by X-ray diffraction analysis, and the magnetocaloric effect for x=0-0.4 was studied by magnetization measurement. The samples were almost single phase with MgCu_2-type cu-bic structure. The magnetization decreased with the increase of Ce. The Curie temperatures (T_c) of Tb_(1-x)Ce_xCo_2 alloys with x from 0.1 to 0.4 were 180, 165, 160 and 152 K, respectively. For x=0.5 in the range from 100 K to 230 K, the point of magnetic transition was not obvious,and thus this article did not discuss the magnetocaloric effects for x=0.5. The maximum magnetic entropy change decreased with the increase of Ce content. The results of Arrott plots showed that the magnetic phase transition was second-order magnetic phase transition in those alloys.
ZHUANG Yinghong1，CHEN Xiang1
(1.Key laboratory of Nonferrous Metal Materials and New Processing Technology,Guangxi University,Nanning 530004,China;
2.Department of Physics and Electronic Informational Engineering,Neijiang Teachers Coll)
Abstract:The phases in alloys (Tb_(1-x)Ce_x)Co_2 with x=0, 0.1, 0.2, 0.3, 0.4 and 0.5 were investigated by X-ray diffraction analysis, and the magnetocaloric effect for x=0-0.4 was studied by magnetization measurement. The samples were almost single phase with MgCu_2-type cu-bic structure. The magnetization decreased with the increase of Ce. The Curie temperatures (T_c) of Tb_(1-x)Ce_xCo_2 alloys with x from 0.1 to 0.4 were 180, 165, 160 and 152 K, respectively. For x=0.5 in the range from 100 K to 230 K, the point of magnetic transition was not obvious,and thus this article did not discuss the magnetocaloric effects for x=0.5. The maximum magnetic entropy change decreased with the increase of Ce content. The results of Arrott plots showed that the magnetic phase transition was second-order magnetic phase transition in those alloys.
Key words:RECo_2 alloy; crystal structure; magnetocaloric effect; X-ray diffraction; rare earths;
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