Y2(Fe1-x-y,Coy,Crx)17化合 物的结构及居里温度

通过x射线衍射及磁测量手段研究了Y₂(Fe_1-y-x,Co_y,C r_x)₁₇化合物的结 构及居里温度.研究结果表明Y₂(Fe_1-y-x,Co_y,Crx)₁₇化合物具有六 角相的Th₂Ni₁₇型结构.随着x的增加，Y₂(Fe 关键词： 2(Fe_1-y-x')" href="#">Y₂(Fe_1-y-x y')" href="#">Co_y x)_{1 7}化合物')" href="#">Cr_x)_{1 7}化合物 x射线衍射 居里温度

Structure and Curie temperature of Y2(Fe1-x-y,Coy,Crx)17 compounds

The structure and Curie temperature of Y₂(Fe_1-x-y,Co_y ,Cr_x)₁₇ c ompounds have been investigated by means of x_ray diffraction and magnetization measurement. The Y₂(Fe_1-x-y,Co_y,Cr_x) ₁₇ compounds have a hexago nal Th₂Ni₁₇_type structure. With increasing x, the unit_ce ll volumes of Y₂Fe_17-xCr_x and Y₂CoFe_16-xCr_x compounds have a small decreas e initially, followed by a greater decrease. It is proved that the magnetic inte raction of Fe atoms at 4f sites of Y₂Fe₁₇ compound is anti ferromagnetic by studying the variation of Curie temperature of Y₂(Fe_{1-x-y,Coy,Crx )17 compounds. The result also shows that a few Co and Cr atoms subst ituti ng for Fe atoms can enhance Curie temperature of Y2(Fe1-x-y,Coy,Crx)17 obviously.}