RFe_7Mn_4Ti化合物的结构和磁性

利用真空电弧熔炼和真空热处理制备RFe7Mn4Ti(R=Y、Tb、Dy、Ho和Er)化合物样品。室温粉末样品的X射线衍射和热磁曲线测量表明:所有这些化合物都具有单ThMn12型结构,其晶格常数a、c和单胞体积V随着稀土元素的不同而变化。在DyFe7Mn4Ti和HoFe7Mn4Ti化合物的热磁曲线上出现了明显的补偿特征,补偿温度分别约为123K和90K。本文还给出了这些化合物的居里温度和饱和磁化强度。

Structure and magnetic properties of RFe_7Mn_4Ti compounds with R=Y, Tb, Dy,Ho, and Er

The effect of Mn substitution for partial Fe in RFe 11Ti on structure and magnetic properties of compounds was researched. RFe 7Mn 4Ti samples (R=Y,Tb,Dy,Ho,Er) were prepared by means of vacuum arc-melting and subsequent vacuum annealing. The structure and magnetic properties of RFe 7Mn 4Ti compounds were investigated by X-ray powder diffraction and magnetic measurements. The following conclusions were obtained: all the RFe tMn 4Ti compounds crystallize in the ThMn 12-type structure. The lattice constants and the unit-cell volume changed with the increase of atomic number for R=Y, Tb, Dy, Ho, and Er. The compensation characters appear for the DyFe 7Mn 4Ti and HoFe 7Mn 4Ti compounds, and the compensation temperatures were about 123 K and 90 K, respectively. The Curie temperature, the saturation magnetization, and saturation moment of RFe 7Mn 4Ti compounds were given.