Abstract
The Sm2Fe17-xGaxC2 (x=0, 2, 3, 4, 5 and 6) samples were prepared by arc melting. X-ray diffraction shows that these alloys are single-phase compounds of the rhombohedral Th2Zn17-type structure except for the sample with x=0, which exhibits a multiphase structure with a predominant alpha -Fe phase. The lattice constants a and c and the unit-cell volumes nu of Sm2Fe17-xGaxC2 compounds with x>or=2 increase monotonically with increasing Gax concentration. The Curie temperature TC and room-temperature saturation magnetization Ms are found to decrease monotonically with increasing Gax concentration x from 635 to 338 K and from 102.3 to 29.0 emu g-1 respectively, as x increases from 2 to 6. The Sm2Fe17-xGaxC2 compounds exhibit an easy c axis anisotropy. The room-temperature anisotropy field is 135 kOe for x=2, which is about 55 kOe higher than that of Nd2Fe14B, and it decreases to 60 kOe at x=4.
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