Ce_2Fe_(16.5)Co_(0.5)合金的磁熵变研究  

Study on magnetic entropy changes in Ce_2Fe_(16.5)Co_(0.5) alloy

作　　者：钟喜春[1] 曾德长[1] 刘正义[1] 张锦[1] 

机构地区：[1]华南理工大学机械工程学院,广东广州510640

出　　处：《功能材料》2005年第3期348-349,356,共3页Journal of Functional Materials

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

摘　　要：在氩保护气氛中用熔炼法制备了Ce2Fe16.5Co0.5合金,通过粉末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Ce2Fe16.5C00.5合金具有菱方Th2Zn17型结构,且存在不同组分的2个相,主相Ce2(Fe,Co)17和次相Ce(Fe,Co)7.在242～285K宽温区出现一个磁熵变平台,从而能够满足磁Ericsson型磁致冷机的要求,这对实际磁致冷应用具有现实意义.Ce2Fe16.5Co0.5 alloy was prepared by arc melting under purified argon protected atmosphere. By means of X-ray diffraction pattern and SQUID magnetometer, structure and magnetic entropy changes in Ce2Fe16.5Co0.5 alloy was investigated. The results show that, the crystal structure was Th2Zn17-type rhombohedral for Ce2Fe16.5Co0.5. There were two different constituent phases in Ce2Fe16.5Co0.5 compound, such as main phase Ce2(Fe, Co)17 and minor phase Ce(Fe, Co)7. A platform of magnetic entropy changes appears in a wide range of temperature from 242 K to 285 K, it can satisfy the Ericsson-type refrigerator's requirements. These results will play a significant role in practical application of magnetic refrigeration.

关 键 词：CezFel16.5Co0.5合金 磁致冷 磁熵变 

分 类 号：O4[理学—物理] TG146.4[一般工业技术—材料科学与工程]