掺杂V的SmFe合金结构转变规律及磁性能的研究  

Structure Transformation and Magnetic Properties of SmFe Alloys by V Doping

作　　者：毛永军[1] 李红卫[1] 罗阳[1] 靳金玲[1] 李扩社[1] 于敦波[1] 

机构地区：[1]北京有色金属研究总院稀土材料国家工程中心有研稀土新材料股份有限公司,北京100088

出　　处：《稀有金属》2013年第4期538-542,共5页Chinese Journal of Rare Metals

基　　金：国家科技部高技术研究发展计划(863计划)(2011AA03A402)资助项目

摘　　要：通过感应熔炼制备了不同V掺杂量的铸态SmFe9-xVx(x=0,0.4,0.8,1.2,1.6,2.0)合金,经过850℃,5 h均匀化退火处理,采用XRD,VSM等方法分析了SmFeV合金的结构和性能,进而研究V掺杂对SmFe合金的结构和性能的影响规律。结果表明:随V掺杂量增加,SmFe合金的相结构发生显著变化,x≦0.4时,SmFeV合金以Th2Zn17型结构存在,x=0.8时,Th2Zn17结构开始转变为ThMn12型结构,但仍有Th2Zn17相存在,当x=1.2时,Th2Zn17相完全消失,转化为ThMn12结构相,随V含量进一步增加,达到x=1.6时,ThMn12结构又开始转变为3∶29型结构,当x=2.0时,ThMn12结构相完全消失,转变为3∶29结构相;V掺杂影响SmFe合金结构变化的同时,对SmFe合金的居里温度也有显著影响:当V掺杂量x=0.4时,Th2Zn17结构相的居里温度大幅度提高,从400 K上升到470 K;随V掺杂量进一步增加,居里温度呈现先升高后下降趋势,在x=1.2时获得最高居里温度,即Tc=590 K,x=2.0时,居里温度下降到最低值,即Tc=480 K;另外,矫顽力随V掺杂量增加也呈现先升高后下降趋势,在x=1.2时获得最高矫顽力,即iHc=207 kA.m-1,同时其剩磁及剩磁比分别为Mr=210 kA.m-1,Mr/M∞=0.5。The as-cast SmFe9_,V, （x = 0, 0.4, 0.8, 1.2, 1.6, 2.0） alloys were prepared by induction melting and subsequent heat treatment in 750 ~C for 5 h, then X-ray diffraction （XRD）, vibrating sample magnetometer （VSM） were used to detect the structures and magnetic properties of SmFeV alloys to analyze its phase transformation. The results showed that SmFeV alloys had different struc- tures and properties with different V content; when x =0.4, the structure was rhombohedral of Th2Znl7 type; when x = 0.8, Th2Znl7 structure transformed into tetragonal of ThMn12 type and some Th2Zn17 still existed; but when x = 1.2, Th2Zn17 structure disappeared completely, and single ThMn12 phase was obtained; for x = 1,6, ThMnl2 phase changed into monoelinal structure of 3： 29 type gradually and transformed into 3：29 phase completely at x = 2.0; the Curie temperature of SmFe alloys varied obviously with increasing V content, the Curie temperature of Th2Znt7 structure changed from 400 to 470 K when V content was x = 0.4, but increasing V content further, Cu- rie temperature went up first and then got down, so it acquired maximum value of 590 K at x = 1.2 and minimum value of 480 K at x = 2.0; besides, the coercivity had the same variation tendency with Curie temperature and it reached maximum of 207 kA.m-1 at x = I. 2, meanwhile, the remanence and remanence ratio were Mx =210 kA.m-l, Mr/M∞ =0.5 respectively.

关 键 词：SmFe合金 V掺杂 相结构转变 

分 类 号：TB34[一般工业技术—材料科学与工程]