Abstract
By altering the preparation conditions, systematic variation of Fe 100− x B x ultrafine amorphous powders with 29 ≤x≤40 has been realized by the chemical reduction method. The preparation mechanism, the co-deposition of iron and boron atoms with boron atoms to stabilize the amorphous structure, was studied. The samples were characterized and investigated mainly by Mössbauer spectroscopy and differential scanning calorimetry. It is found that, with increasing boron contents in the samples, the average magnetic hyperfine field H decreases nearly linearly with a slope of about −4.7 kOe per B atom and the crystallization temperature shows a tendency, to increase. From the linear relationship of H vs. x, electron transfer from B to Fe was suggested. It is extrapolated that the powders will become paramagnetic when the B content reaches about 70 at.% and the H for pure amorphous iron is about 340 kOe, in nice agreement with the cases in amorphous ribbons.
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