Abstract
A local model based on the idea that the atoms are distributed within a crystalline lattice, following a binomial probability method for describing the hyperfine field distribution (HFD) obtained from room temperature M�ssbauer spectra is presented. It is applied to disordered, 3.5 wt%, Fe–Si mechanically alloyed during 15, 30, 50 and 75 h. This model also permits, through a fitting parameter, to evaluate the influence of the alloy milling time. The theoretical curves have fitted quite well with the experimental ones and the fitting parameters show that, in agreement with the experimental data, when each silicon atom substitutes an iron atom in the nearest neighborhood, an approximately 3 T diminishment in the hyperfine field is presented. This model also allows us to conclude that the presence of silicon atoms in the next nearest neighborhood have practically no influence in the hyperfine field, because its representative parameter fits for these alloys with a zero value.
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