Gd_(3-x)Mn_xAl_(1.8)Ga_(0.2)合金晶体结构和绝热温变的研究  

Crystal Structure and Adiabatic Temperature Change of Alloy Gd_(3-x)Mn_xAl_(1.8)Ga_(0.2)

作　　者：生利英[1] 黄焦宏[2] 曹朝霞[1] 齐勇田[1] 宋博宇[1] 

机构地区：[1]包头职业技术学院材料系,内蒙古包头014030 [2]包头稀土研究院,内蒙古包头014010

出　　处：《铸造技术》2015年第12期2820-2821,2838,共3页Foundry Technology

基　　金：内蒙古自治区高等学校科学研究资助项目(NJZC13359)

摘　　要：制备了不同Mn含量的Gd_(3-x)Mn_xAl_(1.8)Ga_(0.2)(x=0,0.1,0.2,0.3)合金,研究了合金的显微结构和磁热特性。结果表明,在Gd3Al1.8Ga0.2合金的基础上,少量Mn替代Gd后合金的晶体结构和最大绝热温变没有发生变化,但居里温度从276 K提高到294 K,表明Gd_(3-x)Mn_xAl_(1.8)Ga_(0.2)合金可以作为室温磁制冷材料。The alloys Gd_（3-x）Mn_xAl_（1.8）Ga_（0.2）（x=0,0.1,0.2,0.3） with different Mn contents were prepared, and the microstructure and the magnetocaloric properties of the alloy were investigated. The results show that the crystal structure and maximal adiabatic temperature change of the alloys do not change after a small amount of Mn substitutes for Gd on the basis of Gd3Al1.8Ga0.2, but the Curie temperature raises from 276 K to 294 K. It indicates that the alloys Gd_（3-x）Mn_xAl_（1.8）Ga_（0.2）can be used as magnetic refrigeration materials at room temperature.

关 键 词：Gd3-xMnxAl1.8Ga0.2 直接测量 绝对温变 晶体结构 

分 类 号：TG139[一般工业技术—材料科学与工程]