Abstract

According to Krogh-Moe's conceptions the structural units of borate glasses are not BO3 triangles and BO4 tetrahedrons but rather groups of a more complex arrangement. The network of sodium-borate glass with 33 mol% Na2O is supposed to consist exclusively of diborate groups. Since pyroborax, a non-crystalline material prepared from sodium-tetraborate-decahydrate by dehydration, essentially consists of diborate groups, it can be regarded as a model for the short-range order of this glass. Accurate measurements of the scattering curves of pyroborax, of a glass melted from borax at 800 °C. and of normally prepared sodium-borate glasses lend new support to Krogh-Moe's group model of borate glass structure.

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