化合物YCo_(12-x)Ti_x和YFe_(12-x)Ti_x的结构与磁性

Structure and Magnetic Properties of Compounds YCo_(12-x)Ti_x and YFe_(12-x)Ti_x

通过 X射线衍射分析和磁性测量研究了化合物 YCo1 2 - x Tix 和 YFe1 2 - x Tix 的结构与磁性 .结果表明 ,化合物 YCo1 2 - x Tix 和 YFe1 2 - x Tix 均具有 Th Mn1 2 型结构 ,室温下为单轴磁晶各向异性 .随着 Ti含量的增加 ,YCo1 2 - x Tix 的居里温度 Tc显著降低 ,而 YFe1 2 - x Tix 的居里温度 Tc 几乎不变 .所有化合物的饱和磁化强度Ms和磁晶各向异性场 Ha 随着 Ti含量的增加而降低 ,这可以用双次晶格模型来解释 .

Structure and magnetic properties of YCo 12-xTi x and YFe 12-xTi x compounds have been investigated by using X-ray diffraction and magnetic measurements. It was found that all compounds investigated are almost single phase with the ThMn 12-type structure. X-ray diffraction patterns of magnetically aligned powder samples indicate that the easy magnetization directions(EMD) of YCo 12-xTi x and YFe 12-xTi x compounds are along the c-axis at room temperature. The lattice parameters increase monotonically with increasing Ti component for all the compounds investigated. The Curie temperature T c decreases monotonically with increasing Ti component for YCo 12-xTi x, while T c of YFe 12-xTi x is almost independent of Ti component. The saturation magnetization M s decreases with increasing Ti component for both systems. The anisotropy field H a of YCo 12-xTi x and YFe 12-xTi x compounds decreases monotonically with increasing Ti component, which can be understood in terms of a two-sublattice model of anisotropy.