Electron-microscope study of ordering effects in the relative position of liquation particles in sodium-borosilicate glass
Abstract
Based on electron-microscope data, a stereologic study has been carried out of the structure of sodium-borosilicate glass heat-treated at a temperature of 610 °C for 5 h (glass G1) and 10 h (glass G2). It is established that the liquation that accompanies heat treatment and causes the formation of spherical particles is at the growth stage in glass G1 and at the recondensation stage in glass G2. Based on an analysis of the pairwise correlation function of the tracks of the particles on a flat cross section of a sample, it is shown that there are ordering elements in the relative spatial position of the particles in both glasses. The results of a study of the pairwise correlation function agree with the results of calculations published in the literature. The key role of ordering effects in the formation of turbidity and other physical properties of the material is pointed out.