| Magnetic measurements on the rapidly solidified Fe Al_(1-x)Cu_x series (x = 0.05-0.40) have been made at temperatures from 77˚K up to 700˚K, and compared with those of the annealed specimens. It was found that ferromagnetis appealed in the alloys with x≥0.30, and the alloys with x≤0.25 remained paramagnetic down to 77˚K. In the ferromagnetic region, magnetization increarses as x increases and so does the Curie point. Rapidly solidified specimens show higher magnetizations and Curie temperatures than those of the annealed. X-ray diffraction data revealed that both specimens, rapidly solidified or annealed, were single-phased in CsCl(B₂) structure with a virtually constant lattice parameter of 2.91A. Rapidly solidified alloys, however, exhibited some extent of disorder in the site occupancies of Al atoms and Fe atoms. The results were analized in terms of the local environmental effect of magnetic atoms. |
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