Abstract
The effect of nitrogen insertion on the structural and magnetic properties of (Sm 1 . 5 Gd 0 . 5 )Fe 1 7 - x Co x compounds has been investigated. X-ray powder diffraction analysis shows that all the nitrides are single phase and crystallize in the Th 2 Zn 1 7 -type structure. The lattice parameters of the (Sm/Gd) 2 Fe 1 7 - x Co x N y compounds increase with increasing x. Magnetization studies indicate that all the samples are ferromagnetic at room temperature. Nitrogen insertion leads to an increase in the Curie temperature T c from 520 K for Sm 1 . 5 Gd 0 . 5 Fe 1 6 Co to 880 K for Sm 1 . 5 Gd 0 . 5 Fe 1 6 CoN 2 . 9 . Moreover, the nitrogen insertion increases the saturated magnetization M s . M s increases from 107.67 emu/g for x = 0 to 149.92 emu/g for y = 3. X-ray diffraction measurements on magnetically aligned powder samples of Sm 1 . 5 Gd 0 . 5 Fe 1 7 - x Co x N y reveal a change in the easy magnetization direction from planar to conical after nitrogen insertion.
Published Version
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