R3(Fe1-xCox)29-yCry(R=Gd,Sm)化合物相稳定性研究

在制备出Gd₃(Fe_1-xCo_x)_29-yCr_{y化合物基础上，成功制备出Sm3(Fe1-xCox)29 -yCry化合物，通过x射线衍射和热磁分析对R3(Fe1-x< /sub>Co x)29-yCry 关键词： 3(Fe1-xCox)29-yCry化合物')" href="#">R3(Fe1-xCox)29-yCry化合物 相结构 单轴磁晶各向异性}

Investigations of phase stability of R3(Fe1-xCox)29-yCry(R=Gd,Sm) compounds

After the Gd₃(Fe_1-xCo_x)_29-yCr_{y< /sub> compound was formed, Sm3(Fe1-xCox)29 -yCry compounds were also successfully fabricated. Phase stability of R3(Fe1-xCox)29-yCr y(R=Gd,Sm) compounds was invest igated by x-ray diffraction and magnetic measurements. Atomic radius theory was employed to interpret why the 3∶29 compounds with high Co component had to cont ain more stabilizing elements. Less stabilizing elements are needed for those wi th larger atomic radius. However,a large atom of a stabilizing element augments the lattice parameter of the compound, which is disadvantageous to the stability of the 3∶29 phase. By studying the phase stability of R3(Fe1-x Cox)29-yCry(R=Gd,Sm) compounds, we have fabricated the Gd3(Fe1-xCox )29-yCry(0.4≤x≤1.0; 4.0≤y≤6.5) and Sm3(Fe1-x}Co_x)_29-y Cr_y(0.4≤x≤1.0; 4.5≤y≤7.5)compounds with room-temperature uniaxial magnetocrystalline anisotropy.