By means of dielectric IR spectroscopy and Raman spectroscopy, the presence in the structure of lanthanum borogermanate (LBG) glass of three-coordinated boron atoms, which are absent in the LaBGeO 5 crystal, has been confirmed. The grouping ratio [BO 3 ] / [BO 4 ] does not depend on the conditions for obtaining glass. An assumption was made about the presence in the glass composition of amorphous nanosized regions of two types, approximately the same chemical composition, but different structure. The regions of the first type contain preferably four-coordinated boron atoms and are the basis for the formation of nuclei of stillwellite crystals, while the regions of the second type are more disordered, and in them most of the boron atoms are located in the centers of oxygen triangles. Il. 3, bibliography: 12 titles.
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2 NTsVO RAS,
3 IOFRAN im. A.M. Prokhorova
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