用快淬方法制备了单相(Er_(1-x)Sm_x)_2Fe_(17)C_y(x=0.2,<3.0;x=0.5,y<2.0)化合物,研究了它们的形成、结构、稳定性及内禀磁性结果表明,它们在高温是稳定的,随碳含量的增加,晶体结构由六角的Th_2Ni_(17)型向菱方的Th_2Zn_(17)型转变间隙碳原子的引入导致了单胞体积的膨胀、室温饱和磁化强度和Curie温度的增加当y>1.0时,(Er_(1-x)Sm_x)_2Fe_(17)C_y样品在室温均显示出单轴各向异性
The (Er_(1-x)Sm_x)_2Fe_(17)C_y(x=0.2, y≤3.0; x=0.5, y≤2.0) compounds with a2:17-type single phase structure were prepared by melt-spinning. The formation, structure,stability and intrinsic magnetic properties of these carbides were studied. The experimental re-sults show that these carbidek are stable at high temperatures. With increasing carbon concen-tration x, their crystal structure changes from the hexagonal Th_2Ni_17-type to rhombohedralTh_2Zn_(17)-type. The introduction of interstitial carbon atoms results in the expansion of theunit cell volumes and the increase of the room temperature saturation magnetization andCurie temperature. The (Er_(1-x)Sm_x)_2Fe_17C_y carbides with y≥1.0 are found to have an easyc-axis anisotropy at room temperature.
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