LaFe_(11.6)Si_(1.4)B_(0.5)快淬带的磁相变和磁熵变  

Magnetic Phase Transition and Magnetic Entropy Change of Melt-Spun LaFe_(11.6)Si_(1.4)B_(0.5) Ribbons

作　　者：谢鲲[1] 余丽艳[1] 刘立强[1] 

机构地区：[1]山东科技大学材料科学与工程学院,山东青岛266510

出　　处：《中国稀土学报》2008年第1期121-124,共4页Journal of the Chinese Society of Rare Earths

基　　金：青岛经济技术开发区科技发展计划(030300204;2005)资助项目

摘　　要：通过熔体快淬法制备了具有NaZn13型立方结构的LaFe11.6Si1.4B0.5化合物。与LaFe11.6Si1.4比较,加入B以后的试样中残余α-Fe杂相的含量显著减少。LaFe11.6Si1.4中加入一定量的B后对居里温度TC没有明显改变,化合物仍然保留了在居里温度附近的一级铁磁/顺磁转变和巡游电子变磁转变特征。LaFe11.6Si1.4B0.5化合物具有和LaFe11.6Si1.4化合物接近的巨大磁熵变,但合成时间可以进一步缩短。The magnetic phase transition and magnetic entropy change of melt-spun LaFe11.6 Si1.4 Bo.5 ribbons were investigated by measuring the magnetization as a function of temperature. Compared with LaFe11.6Si1.4, the NaZn13-type structure of melt-spun LaFe11.6Si1.4Bo.5 ribbons did not change after introducing B atoms, while the amount of a-Fe phase in the ribbons de-creased significantly. The Curie temperature changed slightly after the addition of B. The LaFe11.6Si1.4B0.5 compound exhibited a first-order magnetic transition and a very large magnetic entropy change, which was also observed in LaFe11.6Si1.4 compound, but the latter compound were obtained by a longer holding time at high temperatures.

关 键 词：La(Fe Si)13化合物 熔体快淬 磁相变 磁熵变 稀土 

分 类 号：TG132.22[一般工业技术—材料科学与工程] TM271[金属学及工艺—合金]