Enhanced maximum energy product of(SmY)FeN caused by abundant yttrium doping

作者：Jianwei Xu,jingwu Zheng,Haibo Chen,Liang Qiao,Yao Ying,Wei Cai,Wangchang Li,Jjing Yu,Min Lin,Shenglei Che

摘要：Replacement of samarium(Sm) with abundant yttrium(Y) can help solve the potential shortage of Sm in the preparation of promising Sm2 Fe17 Nx magnets.In this article,phase composition,microstructure and magnetic properties of(Sm1-yYy)2 Fe17Nx(y=0,0.2,0.4,0.6,0.8,1.0) were investigated.Maximum energy product(BH)max is improved when less than 40 at% Y is doped in(Sm1-yYy)2 Fe17Nx powder.In particular,when 20 at% Y replaces Sm,(BH)max of(Sm1-yYy)2 Fe17Nx powder increases by 15.1% from 131.7 to151.6 kJ/m3.The effect of annealing temperature on the structural properties of high Y doping(Sm0.6Y0.4)2 Fe17 and the magnetic properties of the corresponding nitrides were subsequently investigated.In the RE2 Fe17 phase grain combination process,the interlaced structure of the rhombohedral Th2 Zn17-type structural phase and the hexagonal Th2 Ni17-type structural phase is formed.Due to shortrange exchange coupling,the nitride with the highest content of two interlaced RE2 Fe17 phases has the highest magnetic properties:Br=1.23 T,HcJ=443.9 kA/m and(BH)max=197.6 kJ/m3.

发文机构：Research Center of Magnetic and Electronic Materials Hangzhou Haisheng Technology Co. Key Laboratory of Magmetic Materials and Devices.Ningbo Institute of Material Technologv&Engineering.Chinese Academy of Science

关键词：SM2FE17NXYsubstitutionMaximumenergyproductAnnealingtemperatureCoexistingRE2Fe17phasesRareearths

分类号： TG1[金属学及工艺—金属学]