(Nd_(1-x)Er_x)_3Fe_(27.3)Ti_(1.7)化合物的结构与磁性

Structural and magnetic properties of (Nd_(1-x)Er_x)_3Fe_(27.3)Ti_(1.7)compounds

通过x射线衍射分析和磁性测量对 (Nd1 -xErx) 3Fe2 7 3Ti1 7化合物的结构与磁性进行了研究 .单相 (Nd1 -xErx) 3Fe2 7 3Ti1 7化合物的成相范围为x =0 0— 0 5之间 ,所有化合物均属于单斜晶系、Nd3(Fe ,Ti) 2 9型结构和A 2 m空间群 .着Er含量的增加 ,(Nd1 -xErx) 3Fe2 7 3Ti1 7化合物的晶胞体积、居里温度TC 和 5K下的饱和磁化强度Ms 均单调减小 ,而 5K下的饱和磁化强度Ms 和Er含量的关系与稀释模型所描述的结果相一致 .(Nd1 -xErx) 3Fe2 7 3Ti1 7化合物从室温的易面转变 5K时的易锥 .室温磁晶各向异性场Ba 随Er含量的增加而减小 ,基于磁晶各向异性的结果 ,给出了 (Nd1 -xErx) 3Fe2 7 3Ti1 7化合物的磁相图 .

Structural and magnetic properties of (Nd 1-x Er x ) 3Fe 27 3 Ti 1 7 compounds have been investigated by means of x ray diffraction and magnetic measurements. All the compounds with x in the range of 0 0—0 5 crystallize in a Nd 3(Fe,Ti) 29 type structure. Substitution of Er for Nd leads to a contraction of unit cell volume. Curie temperature T C of the (Nd 1-x Er x ) 3Fe 27 3 Ti 1 7 compounds decreases monotonically with increasing Er content. Saturation magnetization M s of the (Nd 1-x Er x ) 3Fe 27 3 Ti 1 7 compounds decreases with increasing x . As temperature decreases from room temperature to 5K, a spin reorientation from easy plane to easy cone occurs for (Nd 1-x Er x ) 3Fe 27 3 Ti 1 7 compounds. The anisotropy field B a for(Nd 1-x Er x ) 3Fe 27 3 Ti 1 7 compounds decreases with increasing Er content. Spin phase diagrams have been constructed for (Nd 1-x Er x ) 3Fe 27 3 Ti 1 7 compounds.