金属间化合物Ho2Co17-xSix的结构和磁性研究

摘要

研究了非磁性原子Si替代Co对Ho2Co17金属间化合物结构和磁性的影响.X射线衍射结果表明, 所有Ho2Co17-xSix(x=0.5,1.0,1.5,2.0,2.5,3.0)化合物都为Th2Ni17型六角结构;化合物的晶格常数和单胞体积都随Si含量的增加而呈线性下降.磁性测量结果表明, Ho2Co17-xSix化合物的饱和磁化强度随Si含量的增加而呈线性下降.从热磁曲线测量观察到, Ho2Co17-xSix化合物在x=0.5时可能呈面各向异性,当0.5≤x≤3.0时出现由易面到易轴的自旋重取向,自旋重取向温度Tsr随Si原子含量的增加先下降,而后又上升,在x=2.5处出现最低点.%The effects of substituting small amounts of Si for Co on the structure and magnetic properties of Ho2Co17 compounds were studied by means of X-ray diffraction and magnetization measurements. All samples are of single phase with the Th2Ni17-type structure. The substitution of Si for Co leads to an approximately linear decreasing in the unit cell volume. The analysis indicates that the saturation magnetization of Ho2Co17-xSix is found to decrease as x increasing from 0 to 3. From thermomagnetization curves measurements, it is assumed that Ho2Co17-xSix compounds display the plane anisotropy at x=0.5. A spin reorientation occurs turning from base-plane into c-axis for 0.5