化合物YCo12-xTix和YFe12-xTix的结构与磁性

通过X射线衍射分析和磁性测量研究了化合物YCo12-xTix和YFe12-xTix的结构与磁性.结果表明,化合物YCo12-xTix和YFe12-xTix均具有ThMn12型结构,室温下为单轴磁晶各向异性.随着Ti含量的增加,YCo12-xTix的居里温度Tc显著降低,而YFe12-xTix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 Compounds YCo12-xTix and YFe12-xTix

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.