Abstract
The effect of the substitution of Co for Fe on the formation, structure and magnetic properties of Sm 2Fe 16GaC y compounds were studied. Compounds with composition Sm 2(Fe 1− x Co x ) 16GaC ( x=0−0.3) and Sm 2(Fe 0.8Co 0.2) 16GaC y ( y=0−2.0) were prepared by arc melting. X-ray diffraction shows that these carbides are almost single phase with the rhombohedral Th 2Zn 17-type structure. The unit cell volume ( v) decreases monotonically with increasing Co concentration ( x). The Curie temperature ( T c) increases with x from 592 K for x=0 to 816 K for x=0.3. The room-temperature saturation magnetization and the anisotropy field are 126.4 emu g −1 and 117 kOe respectively when the Co concentration x reaches 0.3. Addition of carbon results in the decrease of saturation magnetization and has a small effect on the Curie temperature and anisotropy field.
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