Abstract
The formation, crystal structure and magnetic properties ofSm2Fe17−xCoxCywere studied. The substitution of Co for Fe helps to stabilize the rhombohedral Th2Zn17-typestructure (2:17) and eliminate α-Fe formation for carbonconcentrations y ≤ 1.5.From the mixing enthalpy calculations based on Miedema’s semi-empirical model andWigner–Seitz cell analysis, it is found that the role of Co in stabilizing the 2:17structure is related to its strong preference for the 18h site, which has a maximumnumber of rare-earth near neighbours in the structure. With increasing Co content,x, the latticeconstants decrease while the Curie temperature rapidly increases. The typical compound Sm2Fe12Co5C1.25has a room temperature saturation magnetization μ0Ms = 1.36 T,a magnetic anisotropy field μ0Hk = 7.1 T,a Curie temperature TC = 874 Kand a possible maximum operating temperature Tmhigher than 473 K.
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