ErFe11-xCoxTi化合物的结构与磁性研究

粉末样品的X射线衍射和热磁曲线测量表明，所有的ErFe_11-xCo_xTi(x=0—11)化合物都结晶ThMn₁₂型结构，且具有良好的单相性.Co替代Fe导致居里温度的显著提高和晶格常数的单调减小，4.2K下的饱和磁化强度M_s随Co含量的增加在x=3处呈现极大值.ErFe_11-xCo_xTi化合物当x≤4时，在室温下具有单轴磁晶各向异性，当6≤x≤9时，样品的易磁化方向垂直于c轴 关键词：

STRUCTURAL AND MAGNETIC PROPERTIES OF ErFe11-xCoxTi COMPOUNDS

X-ray diffraction patterns and thermomagnetic curves show that all compounds are almost of single phase.All ErFe_11-xCo_xTi compounds (x=0—11) crystallize in the ThMn₁₂-type structure.Substitution of Co for Fe leads to an increase of Curie temperature and a monotonic decrease of lattice constants.The composition dependence of saturation moments exhibits a maximum at about x=3. The easy magnetization direction (EMD) at room temperature,for x≤4, is along the c-axis, for 6≤x≤9,is perpedicular to the c-axis, while for further increasing x, it goes back to the c-axis. The interesting change of EMD of ErFe_11-xCo_xTi compounds may result from the preferential occupation of Co and the different contribution to the magnetocrystalline anisotropy from different transition-metal sites.For all ErFe_11-xCo_xTi compounds, a spin reorientation occurs below the Curie temperature.A tentative phase diagram for ErFe_11-xCo_xTi compounds has been given.