Study on Gd-Si-Ge Alloys Using Domestic Gd
来源期刊：JOURNAL OF RARE EARTHS2004年第5期
论文作者：卢定伟 吴卫
Key words：metal materials; giant magnetocaloric effect; Gd-Si-Ge alloys; Gd; impurity; rare earths;
Abstract: To evaluate the possibility of using Gd-Si-Ge alloys in magnetic refrigerators,samples of Gd-Si-Ge alloys were made of domestic Gd.The magnetocaloric effect of samples was estimated by magnetic entropy change (-ΔSm) calculated from M-H curves according to Maxwell relation.The first order phase transformation was destroyed due to the impurities in the commercial Gd,so that no giant magnetocaloric effect was found.The samples made of purified Gd exhibit first order phase transformation,and the -ΔSm is basically consistent with the published data of Ames laboratory,USA.This work proves that Gd-Si-Ge alloys made of domestic Gd can be utilized in magnetic refrigerators.
卢定伟1，吴卫2
(1.Department of Physics,Nanjing University,Nanjing 210093,China;
2.Department of Materials Science and Engineering,Sichuan Institute of Technology,Chengdu 610039,China)
Abstract:To evaluate the possibility of using Gd-Si-Ge alloys in magnetic refrigerators,samples of Gd-Si-Ge alloys were made of domestic Gd.The magnetocaloric effect of samples was estimated by magnetic entropy change (-ΔSm) calculated from M-H curves according to Maxwell relation.The first order phase transformation was destroyed due to the impurities in the commercial Gd,so that no giant magnetocaloric effect was found.The samples made of purified Gd exhibit first order phase transformation,and the -ΔSm is basically consistent with the published data of Ames laboratory,USA.This work proves that Gd-Si-Ge alloys made of domestic Gd can be utilized in magnetic refrigerators.
Key words:metal materials; giant magnetocaloric effect; Gd-Si-Ge alloys; Gd; impurity; rare earths;
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