Er_(2-x)Pr_xFe_(17)磁致冷合金在室温区的磁熵变  

Magnetic Entropy Changes of Er_(2-x)Pr_xFe_(17) Magnetic Refrigeration Alloys at Room Temperature Range

作　　者：钟喜春[1] 刘正义[1] 曾德长[1] 张锦[1] 魏兴钊[1] 

机构地区：[1]华南理工大学,广州510640

出　　处：《稀有金属材料与工程》2005年第7期1065-1068,共4页Rare Metal Materials and Engineering

基　　金：广东省自然科学基金重点项目(C013003);华南理工大学自然科学基金项目(305-E5040360);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)

摘　　要：在氩保护气氛中用熔炼法制备了Er2-xPrxFe17系列合金,通过X射线衍射和SQUID磁强计研究了样品的结构和磁熵变。结果表明,Er2-xPrxFe17系列合金具有六方Th2Ni17型结构,通过成分微调使其居里温度处在室温附近,Er2-xPrxFe17合金有较大的磁熵变,且致冷温区较宽,是一类有很大应用潜力的室温磁致冷材料。A series of Er2-xPrxFe17 alloys were prepared by the arc melting under the purified argon atmosphere. By means of X-ray diffraction pattern and SQUID magnetometer, the structure and magnetic entropy changes in Er2-xPrxFe17 alloys were investigated. The results show that the crystal structure is Th2Ni17-type hexagonal for Er2-xPrxFe17 alloys; the Curie temperature of Er2-xPrxFe17 alloys can be shifted to the room temperature around by a small adjustment of composition. Magnetic entropy changes (-ΔSM) near Curie temperature are relatively large in a comparatively wide temperature range for Er2-xPrxFe17 alloys. Er2-xPrxFe17 alloys are provided with great potential in application for the room-temperature magnetic refrigeration.

关 键 词：Er2-xPrxFe17合金 磁致冷 磁熵变 

分 类 号：TB64[一般工业技术—制冷工程]