Determining parameters of the local atomic structure of Cu-Ni and Cu-Mn alloys by the method of extended electron-loss fine structure spectroscopy

In this work, we consider the possibility of analyzing local atomic structure based on strongly overlapping experimental extended electron-energy-loss fine structure (EELFS) spectra of two different chemical elements. M 2,3 EELFS spectra have been obtained from the surface of Cu x Ni 1 − x and Cu x Mn 1 − x ( x = 0.5) alloys. The method of determining the parameters of the local atomic structure (coordination numbers, lengths of the chemical bonds, and the parameters of their dispersion) of the nearest atomic surroundings in ultrathin (1–5 nm) surface layers of two-component alloys of 3 d metals has been suggested based on the overlapping extended fine structures of the electron-energy-loss spectra. The method was tested on experimental M 2,3 EELFS spectra of the surface of testing alloys Cu 50 Ni 50 and Cu 50 Mn 50 .