Mössbauer spectroscopy study of the disordering process of Fe₇₀Si₃₀ alloy

Highlights: • Ball milled Fe₇₀Si₃₀ alloy has three different structure (D0₃, D8₈ and B20). • The amount of D8₈ and B20 structures varies the Si content of the D0₃ structure. • The disordering process has three different stages. • The behavior of the magnetization with milling time can be explained in terms of the behavior of the different structures. - Abstract: In this work we study systematically the influence of mechanical attrition on the magnetic and structural properties of annealed Fe₇₀Si₃₀ alloy by means of Mössbauer spectroscopy, X-ray diffraction measurements and magnetic measurements. In order to obtain different stages of disorder the annealed (ordered) alloys were deformed by ball milling during different number of hours. The annealed alloy presents two different structures (D0₃ and D8₈) and the deformation of the annealed sample with ball milling induces the appearance of B20 structure. The variation of the amount of D8₈ and B20 structures makes the Si content of the D0₃ structure vary, which affects the magnetic properties. The disordering process has three different stages, characterized with different magnetic behaviors