金属间化合物Y(Fe_(1-x)Co_x)_(11.3)Nb_(0.7)的磁性能机制研究

Magnetic Mechanism of Y(Fe_( 1-x)Co_x)_(11.3)Nb_(0.7) Intermetallic Compounds

通过X射线衍射和磁性测量方法研究了金属间化合物Y(Fe1 -xCox) 1 1 .3 Nb0 .7(x =0 ,0 0 5 ,0 10 ,0 2 0 )的结构与磁性能。粉末样品的X射线衍射和热磁曲线测量表明 ,所有Y(Fe1 -xCox) 1 1 .3Nb0 .7(x =0 ,0 0 5 ,0 10 ,0 2 0 )化合物具有ThMn1 2 型结构 ,具有良好的单相性。Co替代Fe引起居里温度显著提高和晶格常数的单调减小 ,室温下的饱和磁化强度Ms 随Co含量的增加在x =0 1～ 0 2之间呈现极大值 ,各向异性场Ba 随x的增加 。

The structure and magnetic properties of the intermetallic compounds Y(Fe 1- x Co x ) 11.3 Nb 0.7 ( x = 0, 0 05, 0 1, 0 2) were studied by X ray diffraction and magnetic properties measurements. The X ray diffraction patterns and thermomagnetic curves show that all compounds almost exhibit single phase. All Y(Fe 1- x Co x ) 11.3 Nb 0.7 compounds ( x =0, 0 05, 0 1, 0 2) crystallize in ThMn 12 type structure. Substitution of Co for Fe leads to a clear increasing of Curie temperature and a monotonic decreasing of lattice constants. At room temperature the composition dependence of saturation magnetization exhibits a maximum at about x =0 1～0 2. The magnetocrystalline anisotropy field at room temperature firstly increases then decreases with the increasing of Co content.