The structure of potassium germanate glasses – a combined X-ray and neutron scattering study

摘要: Abstract X-ray scattering experiments on potassium germanate glasses of 11 and 20 mol% K2O confirm the change Ge–O coordination state which was obtained by earlier neutron studies. The O–O Ge–Ge numbers are extracted help different contrast data. Their behavior agrees with model assumption increase NGeO absence non-bridging oxygen atoms up to about concentration. Reverse Monte Carlo (RMC) simulations used analyze changes in medium-range order (MRO). modified assumed be quasi-binary systems formed K GeOn units where latter represented their central Ge positions. According Bhatia/Thornton formalism first diffraction peak is identified as a chemical prepeak indicates preference K–Ge neighbors packing sites. pair distributions show additional features explained needs network linkages steric effects K+ cations environments GeO4 tetrahedra.