(Fe70Al30)100 - xSix (x ¼ 0, 5, 10 and 20) alloys were obtained by mechanical milling for durations of 12, 24 and 36 h. They were studied
by X-ray diffraction (XRD), Mössbauer spectrometry and magnetic measurements at room temperature. The XRD experiments show
that all the samples have the Fe-BCC phase and for x ¼ 20 an additional Fe0.34Si0.66 phase appears. The obtained Mo¨ ssbauer spectra
show a decreasing broad magnetic component and increasing broad paramagnetic component when the Si concentration increases. The
spectra were fitted by using a hyperfine field distribution and a quadrupolar splitting distribution, respectively. The broad spectra show
the disordered character of the samples. When the milling time increases the mean HF increases. These results suggest that Si acts as
magnetic dilutor and that the milling time increases the magnetism. All the samples present magnetic hysteresis cycles in which the
coercive field decreases with the Si increase, improving in this way the semi-soft character of the alloy. |
