Gd_3Al_(2-x)Ga_x系合金磁热效应的研究  

Study on Magnetocaloric Effect of Gd_3Al_(2-x)Ga_x

作　　者：生利英[1] 曹朝霞[1] 黄焦宏[2] 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014030

出　　处：《稀土》2016年第4期96-100,共5页Chinese Rare Earths

基　　金：内蒙古自治区高等学校科学研究项目(NJZC13359)

摘　　要：对经真空高频磁悬浮炉熔炼、900℃30 h热处理的Gd_3Al_(2-x)Ga_x(x=0,0.1,0.2,0.3)系列合金的组织结构和磁热效应进行了研究。研究发现,Gd_3Al_(2-x)Ga_x系列合金保持了Gd3Al2的简单正方晶体结构,热处理后基相Gd_3Al_2的含量增加,随着Ga含量的增加,Gd_3Al_(2-x)Ga_x合金的居里温度变化在1 K^2 K之间,在1.5 T的外加磁场下,△S_m-T曲线半峰宽几乎不变,Gd_3Al_(1.8)Ga_(0.2)合金的最大磁熵变最大,超过Gd_3Al_2的最大磁熵变30%。少量Ga替代Al可以提高Gd_3Al_2合金的磁热效应。The organization structure and the magnetocaloric effect of Gd3Al2-xGax（0.1 x = 0,0.2,0.3 ） series alloy prepared by smelting in a a high-frequency floating furnace and annealing treatment at 900 ℃for 30 h were investigated. The results show that Gd3Al2-xGaxseries alloy keeps simple tetragonal crystal structure of Gd3 Al2. The content of base phase Gd3 Al2 increases after heat treatment. The Curie temperature of Gd3Al2-xGax series alloy changes between 1 K - 2 K along with the in- crease of the content of Ga. The half peak width of△Sm-T crave is ahnost the same. The maximum magnetic entropy changes of Gd3Al1.8Ga0.2 alloy is the largest under magnetic field changes of 1.5 T, which exceeds 30% of Gd3Al2 alloy. A small amount of Ga to replace AI can improve the magnetocaloric effect of Gd3Al2 alloy.

关 键 词：Gd3Al2-xGax 居里温度 磁熵变 晶体结构 

分 类 号：TG146.453[一般工业技术—材料科学与工程]