低磁场下获得巨磁热效应的GdSiGeZn合金

上海大学学报(自然科学版) ›› 2010, Vol. 16 ›› Issue (1): 35-37.

低磁场下获得巨磁热效应的GdSiGeZn合金

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

(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)

收稿日期:2009-09-24 出版日期:2010-02-28 发布日期:2010-02-28
通讯作者: 侯雪玲(1965～)，女，高级工程师，研究方向为磁制冷工质材料. E-mail:flybird1656@163.com
基金资助:
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）

Magnetocaloric Effect of GdSiGeZn Compound under Applied Low Magnetic Field

HOU Xue-ling1,2,HU Xing-hao2,WANG Xue-zhen2,ZENG Zhi2,XU Hui1,2,ZHOU Bang-xin1,2

（1. Key Laboratory for Advanced MicroAnalysis, Shanghai University, Shanghai 200072, China; 2. Institute of Materials, Shanghai University, Shanghai 200072, China）

Received:2009-09-24 Online:2010-02-28 Published:2010-02-28

摘要/Abstract

摘要：

在研究Gd₅Si_2-xGe₂Zn_x,Gd₅Si_2-zGe_2-zZn_2z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(Si_1-yGe_y)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. 

关键词: 磁热效应；等温磁熵变；居里温度

Abstract:

[It was found in a study on the magnetocaloric effect of Gd₅Si_2-xGe₂Zn_x and Gd₅Si_2-zGe_2-zZn_2zserial 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 (ΔS_M) 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 Gd₅Si₂Ge₂compound. Experimental results show Gd₅Si₂Ge₂compound which are alloyed by a trace amount of Zn element has better magnetocaloric properties than that of Gd₅Si₂Ge₂compound alloyed by other elements reported in the literature. The overall magnetocaloric properties are the best among other Gd₅Si₂Ge₂alloys upon 5 T applied field.

Key words: magnetocaloric effect; isothermal magnetic entropy change; Curie temperature

中图分类号:

TF 125

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. 低磁场下获得巨磁热效应的GdSiGeZn合金[J]. 上海大学学报(自然科学版), 2010, 16(1): 35-37.

HOU Xue-ling1,2,HU Xing-hao2,WANG Xue-zhen2,ZENG Zhi2,XU Hui1,2,ZHOU Bang-xin1,2. Magnetocaloric Effect of GdSiGeZn Compound under Applied Low Magnetic Field[J]. Journal of Shanghai University（Natural Science Edition）, 2010, 16(1): 35-37.