Co_(1.2)Mn_(0.8)B化合物的磁性能与磁热效应  

Magnetic Properties and Magnetocaloric Effect of Co_(1.2)Mn_(0.8)B Compound

作　　者：王岛[1] 马垒[1,2] 赵世谦 郭永斌 Wang Dao;Ma Lei;Zhao Shiqian;Guo Yongbin(School of Materials Science and Engineering,Guilin University of Electronic Technology,Guilin 541004,China;Guangxi Key Laboratory of Information Materials,Guilin University of Electronic Technology,Guilin 541004,China)

机构地区：[1]桂林电子科技大学材料科学与工程学院,广西桂林541004 [2]桂林电子科技大学广西信息材料重点实验室,广西桂林541004

出　　处：《稀有金属材料与工程》2018年第9期2782-2786,共5页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51461012);广西信息材料重点实验室项目(161011-Z);桂林电子科技大学-中铝广西有色金源稀土有限公司研究生联合培养基地专项经费资助项目(20160513-11-Z);国家重点基础研究发展计划(2014CB643703);广西自然科学基金(2016GXNSFAA380030)

摘　　要：采用球磨和固相烧结相结合的方法制备了Co_(1.2)Mn_(0.8)B化合物,并对其晶体结构、磁性能和磁热效应进行了研究。结果表明,Co_(1.2)Mn_(0.8)B化合物的物相为Co_2B单相结构,具有CuAl2型体心正方晶体结构,空间群为I14/mcm;在居里温度TC=175 K附近,化合物发生了铁磁(FM)-顺磁(PM)二级磁相转变,热滞为0.7 K;Co_(1.2)Mn_(0.8)B化合物在外磁场0～5 T变化下的最大磁熵变ΔSM为1.17 J·(kg·K)^(-1),其对应的温度不随外场的变化而变化。The Co1.2Mn0.8B compound was prepared by ball milling combined with solid state reaction.The crystal structure,magnetic properties and magnetocaloric effect of the Co1.2Mn0.8B compound have been investigated.The results show that the phase structure of the compound is Co2B single phase with the CuAl2-type tetragonal crystal structure,and the space group of I14/mcm.The Co1.2Mn0.8B compound undergoes second-order magnetic phase transitions from ferromagnetic（FM） state to paramagnetic（PM） state in the vicinity of Curie temperature of 175 K,and the thermal hysteresis is about 0.7 K.The maximal magnetic-entropy change（ΔSM） of the compound reaches 1.17 J/kg·K in an external magnetic field of 0～5.0 T,and the temperature corresponding to ΔSM does not change with the variation of the external field.

关 键 词：Co1.2Mn0.8B化合物 居里温度 磁性能 磁热效应 

分 类 号：TG115.22[金属学及工艺—物理冶金] TG115.27[金属学及工艺—金属学]