Abstract
Results from a study of glasses of the Na2O-B2O3-SiO2-GeO2 system and porous materials obtained from them are presented. Conclusions about the appearance of highly coordinated germanium atoms in the network of the initial glasses with a decrease in the SiO2/GeO2 ratio and simultaneous decrease in the number of non-bridging oxygen atoms are drawn according to the results of Raman spectroscopy. The characteristics of the porous materials were determined by the nitrogen adsorption/desorption method. It is noted that the growth of the specific surface area and pore volume depends on the structural features of the initial glass. The porous characteristics of glass are shown to be directly dependent on the number of six-coordinated germanium atoms and inversely dependent on the number of non-bridging oxygen atoms. It is shown that the replacement of silicon oxide with germanium oxide in the Na2O-B2O3-SiO2 system leads to an increase in the pore diameter, which may be due to the absence of a secondary germanium residue.
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