Methodology of interfacial regions in FeMCuB-type nanocrystals

A fitting model based on the use of two independent blocks resulting from distributions of hyperfine fields and one sextuplet of Lorentzian lines is introduced to simulate Moessbauer spectra of FeMCuB-type nanocrystals. It is discussed for the spectra of M = Mo, Nb, and Ti alloys in the first stage of crystallization. One distribution is ascribed to the amorphous residual matrix, while the other is attributed to Fe atoms located in the interface zone. The sextuplet of Lorentzian lines identifies α-Fe crystalline phase. Three-dimensional mappings of hyperfine field distributions and models of structural arrangement and topography of hyperfine interactions are briefly reported