Fragment model as a phase analysis method for diffraction amorphous materials

Analysis of the atomic structure of metallic glass of composition Al87Ni10Nd3 with the use of a fragmentary model

“…3), we can see that the first maximum of the experimental ARDF coincides in position with the first maximum of the model. The first maximum of the experimental ARDF is wider and higher than the first maximum of the model plotted according to the formula suggested in [1,2]: (2) with the same upper integration limit on the diffrac tion vector S as in the calculation of the experimental ARDF and with the introduction of the attenuation coefficient α. In Eq.…”

“…The model ARDF of one structural fragment represents the radial section of a spherically symmet rical Paterson function plotted according to the com plete X ray structural data of the crystal counterpart. The main principles of the method of analysis of the atomic structure of diffraction amorphous substances based on the fragmentary model are given in [1]. The method has proven effective in the analysis of the atomic structure of amorphous materials not only with a predominantly covalent type of bond, but also for AMAs [2][3][4].…”

“…2. Calculation of the experimental ARDF was performed according to the equation suggested in [1,2]: (1) where D x is the X ray density of aluminum, g/cm 3 ; M is the mass of the alloy of formula composition in carbon units; m H is a coefficient which corresponds to 1.65; and K i corresponds to the relative scattering abilities of atoms included in the alloy. Scattering by the lightest atoms of this alloy, namely, aluminum, was considered the unit of scattering.…”