稀土学报（英文版）
稀土學報（英文版）
희토학보（영문판）
JOURNAL OF RARE EARTHS
2004年
5期
654-657
,共4页
metal materials%giant magnetocaloric effect%Gd-Si-Ge alloys%Gd%impurity%rare earths
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.
