MAGNETIC-PROPERTIES OF SM2FE15SI2CX COMPOUNDS PREPARED BY ARC MELTING

X-ray diffraction measurements show that the Sm2Fe15Si2Cx (x = 0, 0.5, 1.0 and 1.5) samples prepared by are-melting are single phase with th e rhombohedral Th(2)Z(17)-type structure. The unit cell volume nu and Curie temperature T-c of the Sm2Fe15Si2Cx compounds increase monotonic ally with increasing carbon concentration. The room temperature temper ature saturation magnetization M(s) is 112.2 emu g(-1) for x = 0.5 it decreases slightly with increasing carbon concentration to 105.6 emu g (-1) for x = 1.5. The sample with x = 0 has an easy-plane anisotropy a nd the samples with x greater than or equal to 0.5 exhibit an easy c-a xis anisotropy. The anisotropy held H-A at 1.5 K and room temperature increases with increasing carbon concentration from 110 to 195 kOe and from 55 to 105 kOe, respectively, as x increases from x = 0.5 to 1.5.