| Crystal structures and magnetic properties of annealed and rapidly solidified Fe-(Al-Fe) alloys have been investigated and compared with each other. In annealed alloys, it was found that paramagnetism appeared at the alloys with x≤0.25, superparamagnetism for x=0.30 and ferromagnetism for x=0.35, 0.40. Rapidly solidified alloys showed paramagnetism at x≤0.15, superparamagnetism at x=0.20, 0.25 and ferromagnetism at≥0.30. Magnetization increased as x increased. The rapidly solidified specimens showed magnetic behaviors than the annealed ones. X-ray diffraction data revealed that specimens both annealed and rapidly solidified, were single-phased in B2 (CsCl)structure with constant lattice parameter, 2.19Å. However, rapidly solidified alloys exhibited some extent of disorder in the site occupancies of Al atoms. The experimental results were analized on the point of view of the local environmental effect of magnetic atoms. |
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