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Fe₈₀{B}_{20{{-}}x}Cₓ (x=0, 2, 4, 7, 9,) amorphous alloys were prepared by rapid quenching from the melt. X-ray diffraction and magnetization measurements were employed to characterize the structure and magnetic properties, and spin-echo nuclear-magnetic-resonance (NMR) experiments have been carried out in order to determine the short-range order (SRO) in these materials. The results show that, with increasing carbon concentration, the coercivity of the amorphous alloys decreases, attaining a minimum at x=7; at the same time, an orthorhombic Fe₃B-like (o-Fe₃B) SRO becomes significantly developed. A similar NMR investigation of the annealed alloys reveals that the o-Fe₃B phase precipitates have softer magnetic properties than the body-centered-tetragonal Fe₃B (bct Fe₃B) precipitates. It is concluded that the desired soft magnetic properties of Fe-B amorphous materials with 7 at.% of the B atoms replaced by C may be attributed to the formation of o-Fe₃B-like SRO.
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Ge et al. (1992) studied this question.
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