Abstract
Abstract Structural, thermodynamical and magnetic properties of Fe 73.5 − x Si 13.5 B 9 Cu 1 Nb 3 Mn x amorphous alloys, with Mn content x = 1 , 3 – 15 , were studied by means of X-ray diffraction (XRD), differential scanning calorimetry (DSC), Mossbauer spectroscopy (MS) and energy-dispersive X-rays (EDX), as-quenched and after annealing. The alloys with x ≤ 7 suffer primary (above ∼ 550 °C) and secondary (below ∼ 680 °C) crystallisation, whereas the alloys with x ≥ 9 only at ∼ 580 °C. Mn doping results in increase (for x ≤ 7 ) and then (for x ≥ 9 ) in decrease of grain size. The hyperfine field of the amorphous precursor and remainder substantially decrease with increase of Mn content x, whereas the fields in crystallites remain nearly independent of x. A paramagnetic component appears at x ∼ 9 and grows with x.
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