【作者】 严达利； 傅斌； 谭明； 王玲玲； 谈清华； 王薇； 吴桃李； 郝延明；

【Author】 YAN Da-li FU Bin TAN Ming WANG Ling-ling TAN Qing-hua WANG Wei WU Tao-li HAO Yan-ming (Department of Physics,Tianjin Normal University,Tianjin 300074,China)

【机构】 天津师范大学物理系；

【摘要】 通过 X 射线衍射及磁测量手段研究了 Tb₂AlFe_16-x Mn_x（x=1,2,3,4,5,6,7,8）化合物的结构与磁性．研究结果表明该化合物具有 Th₂Ni₁₇型结构,随着 Mn 替代量 x 的增加,化合物的单胞体积 V 表现为先缓慢而后较快的线性增加,晶胞参数 c 单调递增,而 a 呈现复杂的变化．磁性质的研究结果表明随着 x 的增加,该化合物的居里温度及自发磁化强度开始急剧下降,后来下降变缓．这可能是与化合物中 Mn 磁矩反平行于 Fe 磁矩有关．更多还原

【Abstract】 The structural and magnetic properties of Tb₂AlFe（16-x）Mn_x（x=1,2,3,4,5,6,7,8）compounds have been investigated by means of X-ray diffraction and magnetization measurements.The compounds crystallize in the Th₂Ni₁₇-type structure.The unit-cell volumes have a slight increase initially,followed by a greater linear increase with increasing manganese concentration x.The unit-cell parameter c increases monotonously with increasing x,while a shows a complicated behavior.Magnetization measurement shows that the Curie temperature T_c and the spontaneous magnetization of Tb₂AlFe_16-xMn_x compounds at 5 K decrease rapidly with increasing x.This implies that the magnetic moment of Mn atom is anti-parallel to the magnetic moment of Fe atom in Tb₂AlFe_16-xMn_x compounds.更多还原