室温磁致冷合金Pr_2Fe_(17-x)Co_x的结构、磁性和磁熵变  

Structure, Magnetic Properties and Magnetic Entropy Changes of Room Temperature Magnetic Refrigeration Alloys Pr_2Fe_(17-x)Co_x

作　　者：钟喜春[1] 曾德长[1] 刘正义[1] 魏兴钊[1] 

机构地区：[1]华南理工大学,广东广州510640

出　　处：《稀有金属材料与工程》2005年第10期1537-1540,共4页Rare Metal Materials and Engineering

基　　金：广东省自然科学基金(05300306);广东省自然科学基金重点项目(C013003);广东省稀土办重点项目(102-B25770);广东省高教厅重点项目(102-B24480);中国教育部骨干教师计划项目(305-D40130);华南理工大学自然科学基金项目(305-E5040360)

摘　　要：在氩气气氛中用熔炼法制备了Pr2Fe17-xCox系列合金,通过粉末X射线衍射和SQUID磁强计研究了样品的结构、磁性和磁熵变.结果表明:Pr2Fe17-xCox系列合金具有菱方Th2Zn17型结构;通过成分微调使其居里温度处在室温附近;Pr2Fe17-xCox系列合金有较大的磁熵变,在低场下的磁熵变是金属Gd的65%～73%,而高场下的磁熵变则为金属Gd的63%～68%;但其成本约为金属Gd的1/10,具有很高的性价比,是一类有很大应用潜力的室温磁致冷材料.A series of Pr2Fe17-xCox alloys were prepared by arc melting under purified argon atmosphere. Structure, magnetic properties and magnetic entropy changes of Pr2Fe17-xCox alloys were investigated by means of X-ray diffraction pattern and SQUID magnetometer. The results show that the crystal structure is Th2Zn17-type rhombohedral for Pr2Fe17-xCox alloys, and the Curie temperature of Pr2Fe17-xCox alloys can be shifted to room temperature around by a small adjustment of composition. Magnetic entropy changes （-△SM） near Curie temperature are relatively large in a comparatively wide range of temperature for Pr2Fe17-xCox alloys. For Pr2Fe17-xCox series of compounds, the magnetic entropy changes under a low and high field approach to 65-73% and 63-68% that of Gd, respectively, but the cost is only 1/1 0 that of Gd. Pr2Fe17-xCox alloys are provided with great potential in application for room-temperature magnetic refrigeration.

关 键 词：Pr2Fe17-xCox 合金 磁致冷 磁熵变 

分 类 号：O482.5[理学—固体物理]