Influence of Sn substitution for Co in RCo2 （R=Gd,Tb,Dy） alloys on the structure and magnetocaloric effect
来源期刊：Rare Metals2007年第2期
论文作者：ZHUANG Yinghong), DENG Jianqiu), LI Junqin), ZHAN Yongzhong), ZHU Qiming), and ZHOU Kaiwen) ) The Key Laboratory of New Processing Technology for Nonferrous Metal and Materials of Chinese Ministry of Education, Guangxi University, Nanning , China ) Shenzhen Key Laboratory of Special Functional Materials & Department of Materials Science and Engineering, Shenzhen University, Shenzhen , China
文章页码：97 - 102
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.
ZHUANG Yinghong1), DENG Jianqiu1), LI Junqin2), ZHAN Yongzhong1), ZHU Qiming1), and ZHOU Kaiwen1) 1) The Key Laboratory of New Processing Technology for Nonferrous Metal and Materials of Chinese Ministry of Education, Guangxi University, Nanning 530004, China 2) Shenzhen Key Laboratory of Special Functional Materials & Department of Materials Science and Engineering, Shenzhen University, Shenzhen 518060, China
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.
关键词：
