Mossbauer and xrd study of the Fe0.5 Si0.5 system produced by mechanical alloying and sinterization

Abstract

In this work Fe0.5Si0.5 samples were mechanically alloyed at different milling times. The sample milled during 48 hours presents the FeSi simple cubic and the BCC Fe phases, with lattice parameters of 4.490 and 2.825 A, respectively, then the sample alloyed during 48 hours ˚ was sintered during 72 hours and later milled at different times. After its sinterization the Fe5Si3 and the FeSi(SC) phases appear. When this sample is milled the FeSi(SC) structure becomes disordered with the milling time, giving place to the BCC Fe-Si disordered phase at 72 grinding hours. By Mossbauer spectrometry it was found that the milled samples present a magnetic behavior which tends to be paramagnetic ¨ at 48 hours, whereas for the thermally treated samples, as the system is disordered, it changes from paramagnetic to ferromagnetic