La-Fe-Si化合物磁热效应的研究  

Investigation of the Magneto Thermal Effect in La-Fe-Si Compound

作　　者：李波[1,2] 张炜[2] 千正男[2] 

机构地区：[1]江苏联合职业技术学院徐州机电工程分院,江苏徐州221011 [2]哈尔滨工业大学凝聚态科学与技术研究中心,黑龙江哈尔滨150001

出　　处：《新技术新工艺》2009年第10期88-91,共4页New Technology & New Process

摘　　要：在众多具有应用前景的磁致冷材料中,具有NaZn13型立方结构的La-Fe-Si化合物以其很好的软磁性、较大的磁化强度和低廉的价格备受瞩目。本文利用X射线衍射仪(XRD)和物理性能测试系统(PPMS)详细研究了LaFe11.7Si1.3化合物的磁性、磁相变和磁熵变等物理性能,发现利用较高的磁场可使材料的熵变值在较宽的温度范围内保持一个恒定值,并分析了磁熵变的产生机制。Among the numerous magnetic refrigeration materials with application potential, the La--Fe--Si compounds with cubic NaZn13 type structure are more promising due to their excellent soft magnetism,high magnetization intensity and low price. In this paper, the magnetism, phase transition and magnetic entropy change of LaFe11. 7 Si13 compounds are well investigated by X-ray power diffractometer（XRD） and physical property measurement system（PPMS）. The results show that the entropy change valve of the material can keep a constant value in wide temperature scope by using higher magnetic field intensity. Finally, the magnetic mechanisms of these compounds were also analyzed.

关 键 词：磁致冷 磁热效应 磁熵变 巡游电子变磁转变 

分 类 号：O48[理学—固体物理]