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.
出处
《中国稀土学报》
CAS
CSCD
北大核心
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)
