Determination of the atomic density and co-ordination parameters of non-crystalline materials from the diffraction data

In addition to well-known correlation and distribution functions used in analysis of the diffraction data of non-crystalline materials a function describing the change of atoms number in a sphere of variable radius in respect to an average number of atoms is proposed. The analysis carried out on the experimental data for liquid Ag–Sn alloys shows that this function can usefully be applied for estimation of the atomic density from the diffraction data of non-crystalline materials as well as for determination of the co-ordination spheres and the co-ordination numbers.