Q~n distribution in silicates: alkali silicate glasses and melts

摘要

Three-parameter statistical method of the calculation of Q~n distribution in silicate melts and glasses has been developed. The method allows deter mining the concentrations of silicate structural units in wide compositions range at different temperatures when only the limited experimental data are available. The method is based on a destruction of the preassigned network as a model of the interaction of the modifier oxide with a silicon-oxygen framework. Q~n distributions in binary alkali silicate glasses and melts were deter mined by this method. It was found that Q~n distribution does not depend on a topology or dimension of the initial network. Moreover, a linear correlations were found to be exist between ln(1/W_i) values (W_1 and W_2 are the first and second adjustment parameters) and 1/r_M (r_M is cation radius, M = Li, Na, K, Rb, Cs). These correlations allow using the concept of a "fictitious" cation radius in order to calculate of the Q~n units at different temperatures.