低磁场下获得巨磁热效应的GdSiGeZn合金  

Magnetocaloric Effect of GdSiGeZn Compound under Applied Low Magnetic Field

作　　者：侯雪玲[1,2] 胡星浩[2] 汪学真[2] 曾智[2] 徐晖[1,2] 周邦新[1,2] 

机构地区：[1]上海大学微结构重点实验室,上海200072 [2]上海大学材料研究所,上海200072

出　　处：《上海大学学报（自然科学版）》2010年第1期35-37,42,共4页Journal of Shanghai University:Natural Science Edition

基　　金：上海市纳米中心资助项目(0352nm030);上海市重点学科建设资助项目(S30107)

摘　　要：在研究Gd5Si2-xGe2Znx,Gd5Si2-zGe2-zZn2z系列合金的等温磁熵变和居里温度时发现,Zn的微量变化对合金的磁热性能影响很大.当x或者2z为0.001时,在1.5 T外加磁场变化下,其最大等温磁熵变分别为20.70 J/(kg.K)(x=0.001)和25.30 J/(kg.K)(2z=0.001),居里温度分别为284 K(x=0.001)和280 K(2z=0.001),其磁热性能远高于没有添加Zn元素的合金(5.03 J/(kg.K)).实验证明,微量元素Zn对Gd5Si2Ge2化合物的合金化处理,可使其在低磁场下的磁热效应得到巨幅提高,其最大等温磁熵变优于文献报道的铸锭合金Gd5(Si1-yGey)4及其他添加元素(如Ga,Sn,Cu,B,Al,Bi,Co,Fe,Ni,Mn,C,H等)替代Si或Ge时在5 T高外加磁场变化下的等温磁熵变.Abstract： It was found in a study on the magnetocaloric effect of Gd5Si2-xGe2Znx and Gd5Si2-xGe2-xZn2x serial alloys that a trace amount of change of Zn element has a great impact on magnetocaloric properties of GdSiGeZn. The maximum isothermal magnetic entropy change （△SM） reaches 20.70 J/（kg·K） at 284 K and 25.30 J/（kg·K） at 280 K for x =0. 001 and 2z =0. 001. These magnetocaloric properties are better than that of undoped Gd5Si2Ge2 compound. Experimental results show Gd5 Si2Ge2 compound which are alloyed by a trace amount of Zn element has better magnetoealoric properties than that of Gd5 Si2 Ge2 compound alloyed by other elements reported in the literature. The over-all magnetocaloric properties are the best among other Gd5 Si2 Ge2 alloys upon 5 T applied field.

关 键 词：磁热效应 等温磁熵变 居里温度 

分 类 号：TF125[冶金工程—粉末冶金]