Gd)4(Bi_xSb_(1-x))_3系列合金在低磁场下的磁热效应  

Magnetocaloric Effect of Gd_4(Bi_xSb_(1-x))_3 Alloy s at Low Magnetic Field

作　　者：王正德[1] 陈明[1] 金培育[2] 刘金荣[2] 邱巨峰[2] 黄焦宏[2] 徐来自[1] 李保卫 

机构地区：[1]包头钢铁学院,内蒙古包头014010 [2]包头稀土研究院,内蒙古包头014010

出　　处：《稀土》2003年第4期45-48,共4页Chinese Rare Earths

基　　金：科技部九五攻关项目99-A30

摘　　要：用高频悬浮炉熔炼了Gd4(BixSb1-x)3系列合金,利用X光粉末衍射技术确定其结构。在1.3T的磁场下,利用自制的△Tad-T曲线测量仪直接测量了该系列合金的磁热效应。发现Gd4(BixSb1-x)3系列合金在低磁场下具有较大的磁热效应,通过改变Bi的含量,其居里温度在267K～332K温度之间增加,从而在一个较宽的温度范围内能获得较大的绝热温变。在对退火前后的样品进行△Tad-T测量后,发现其热稳定性很好。实验结果说明Gd4(BixSb1-x)3系列合金是一种性能良好的磁致冷材料。The Gd4(BixSb1-x)3 system of alloys were prepared in a high-frequency levitation furnace The structures of the samples were examined by XRD method The magnetocaloric effects of the alloys were measured directly using the self-made △Tad-T curve measurement device at the magnetic field of 13 Tesla The experimental results show that their curie temperature (Tc) can be adjusted between 267K and 332K by changing the Bi concentration and the magnetocaloric effects (△Tad) are strong in wider temperature span And the thermal stability of the alloys is fine during annealing treatment Thus the Gd4(BixSb1-x)3 system alloys qualify as a magnetic refrigeration material

关 键 词：磁热效应 磁致冷材料 Gd4(BixSb1-x)3系列合金 居里温度 

分 类 号：O482.6[理学—固体物理] TM27[理学—物理]