Abstract
Fe 57 Mössbauer spectra of Sm 2Fe 17− x Ga x C y , where 0 ≤ x ≤ 3 and 0 ≤ y ≤ 2.5, have been measured at room temperature and analyzed. These compounds have the rhombohedral Th 2Zn 17 structure. Mössbauer studies indicate that all the samples studied are ferromagnetically ordered. The average hyperfine field for compounds with y = 0 was found to increase for x = 1 and then decrease with increasing x. For fixed x, the average hyperfine field was found to decrease by a very small amount with increasing carbon concentration. Analyses of the spectra show that Ga atoms occupy the 6c, 18h, and 18f but not 9d Fe sites and the fraction of occupancy of Ga is found to depend on x, in agreement with our previous observations on Sm 2Fe 17- x Al x . Some of the compounds studied have an easy c-axis anisotropy and relatively high Curie temperature. The excellent intrinsic magnetic properties make some of these compounds promising candidates for permanent magnet development.
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