Glasses of the Na 2 O - В 2 O 3 - SiO 2 system with a content of В 2 O 3 from 20 to 40%. It was shown that with a gradual increase in boron oxide content, the silicate network undergoes depolymerization, which is confirmed by a change in the ratio of the intensities of the bands characteristic of tetrahedra with different numbers of nonbridging oxygen atoms ( Q 2 and Q 3 ). The borate component contains BO 4 tetrahedra, which are then replaced by asymmetric BO 3 triangles with nonbridging oxygen atoms. Il. 3, bibliography: 5 titles.
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