Abstract
Sm 2(Fe 1− x Ga x ) 17 ( x = 0–0.5) compounds were prepared by arc melting. X-ray diffraction patterns showed that all compounds were single phase with rhombohedral Th 2Zn 17-type structure. X-ray diffraction patterns of the aligned samples showed that the alloys with x = 0.15, 0.20 and 0.25 have uniaxial anisotropy at room temperature. The spin reorientation transition temperatures were measured by a superconducting quantum interference device (SQUID) and a magnetic balance. A tentative phase diagram was constructed. The substitution of Ga for Fe leads to an increase in the reorientation temperature and the lattice constants. The Curie temperature increases with the Ga concentration, and achieves a maximum at x = 0.2, then decreases. The saturation magnetization decreases monotonically with Ga concentration. The coupling constants A TT and A RT were derived using a mean molecular field model. A TT reaches a maximum at x = 0.3 and then decreases with x, but A RT is almost unchanged with varying x.
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