室温以上磁制冷材料La(Fe_(1-x)Co_x)_(11.7)Al_(1.3)化合物的研究  

Magnetic Refrigeration Material of La(Fe_(1-x)Co_x)_(11.7)Al_(1.3) Compound above Room Temperature

作　　者：黄鹏[1] 段静芳[1] 鲍博[1] 张虎[1] 龙毅[1] 叶荣昌[1] 常永勤[1] 万发荣[1] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083

出　　处：《中国稀土学报》2007年第5期584-587,共4页Journal of the Chinese Society of Rare Earths

基　　金：国家自然科学基金;国家基础研究计划资助项目(50571008)

摘　　要：通过X射线衍射分析和超导量子干涉磁强计(SQUID)磁性测量,研究了Co替代Fe含量对居里温度在室温以上的磁制冷材料La(Fe1-xCox)11.7Al1.3(x=0.072,0.081)磁结构和磁性能的影响。La(Fe1-xCox)11.7Al1.3材料的居里温度随Co的含量增加而增加,La(Fe0.919Co0.081)11.7Al1.3的居里温度为311 K。当外场变化为1.9 T时磁熵变达到3.6 J.kg-1.K-1,RCP值为168.6 J.kg-1,虽然它的磁熵变小于具有巨磁熵变的磁制冷材料,但是它在磁场为1.9 T时的制冷能力与这些材料相当。Substitution effects of Co for Fe on the structure and magnetic properties of the material La（Fe1-xCox）11.7Al1.3（x=0.072, 0.081） were investigated by using X-ray diffraction（XRD） and superconducting quantum interference device magnetometer（SQUID）.The Curie temperature increased with the increasing of Co content and the Curie temperature of La（Fe0.919Co0.081）11.7Al1.3 was 311 K.The maximum magnetic entropy change of La（Fe0.919Co0.081）11.7Al1.3 was 3.6 J·kg^-1·K^-1 and its RCP was 168.6 J·kg^-1 when ΔH was 1.9 T.Although its ΔS was not as much as the ΔS of other magnetic refrigeration materials with giant magnetocaloric effect,its relative cooling power RCP was comparable with theirs.

关 键 词：相对制冷能力 La(Fe Co Al)13化合物 磁熵变 稀土 

分 类 号：TM271[一般工业技术—材料科学与工程]