Mn掺杂对Co_2B化合物结构与磁性能的影响  

Influences of Mn-doped on Structure and Magnetic Properties of Co_2B Compounds

作　　者：王岛[1] 马垒[1,2] 周良[1] 赵世谦 

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：《热加工工艺》2017年第14期74-77,81,共5页Hot Working Technology

基　　金：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项目(20160513-11-Z);国家自然科学基金项目(51461012)

摘　　要：采用高能球磨和固相反应相结合的方法制备了Co_(2-x)Mn_xB(x=0~1.2)化合物。利用X射线衍射仪、振动样品磁强计、差示扫描量热仪(DSC)等手段对其晶体结构和磁性能进行了研究。结果表明:当Mn含量0≤x≤1.0时,该系列化合物为单一的Co_2B相,均为CuAl_2型体心正方晶体结构,空间群为I14/mcm;当Mn含量x>1.0时,该化合物出现少量的MnB第二相,第二相为FeB-b型简单斜方晶体结构,空间群为Pnma。通过调节Co/Mn的比例可在较大温度区间调控该系列化合物的反铁磁(AFM)-铁磁(FM)转变、铁磁(FM)-顺磁(PM)的磁相转变。随Mn含量的增加,化合物的奈尔温度(TN)逐渐增大,居里温度(TC)逐渐减小;并通过差热分析解释了相变温度变化的原因。Co_（2-x）Mn_xB（x=0~1.2） compounds were prepared by the combination of high energy ball-milling and solid state reaction method, and the crystal structure and magnetic properties of the compounds were characterized by X-ray diffraction （XRD）, vibrating sample magnetometer （VSM） and differential scanning calorimetry （DSC）. The results show that the compound structure is single Co_2B phase, which presents CuAl2-type tetragonal crystal structure with space group of/14/mcm, when Mn content x increasing from 0 to 1.0. However, a little second phase MnB presenting FeB-b type simple rhombic crystal structure with space group of Pnma appears, when x is more than 1.0. The magnetic phase transition of antiferromagnetic （AFM）-ferromagnetic （FM） and ferromagnetic （FM）-paramagnetic （PM） can be controlled by adjusting the ratio of Co/Mn in Co2-xMn-xB compounds in a large temperature range. With the increase of Mn content, the Neel temperature （T_N） of the compounds increases gradually and the Curie temperature （Tc） decreases gradually. Finally, the reasons for the changes in the phase transition temperature were explained by DSC analysis.

关 键 词：Co2B化合物 MN掺杂 晶体结构 磁性能 

分 类 号：TG113.225[金属学及工艺—物理冶金]