Abstract
The 11B Fourier transform spectra have been used to study the structure of Na 2OB 2O 3SiO 2 glasses. Based on the measurements of the fraction N 4 of boron atoms in the boron oxygen tetrahedra, a structural model has been proposed to explain the change of N 4 with composition in the region of high alkali (Na 2O/B 2O 3 = R ⩾ 2) and high silica (SiO 2/B 2O 3 = K ⩾8). It is claimed that in this region boron atoms may only exist in reedmergnerite [BSi 3O 10] −1 units and pyroborate [B 2O 5] −4 units. In addition, a sharing rule for Na 2O between the borate and silicate networks is postulated. In the corresponding composition region, when one molecule of Na 2O is taken up by the borate network, two [BSi 4O 10] −1 units are destroyed to create one [B 2O 5] −4 unit.
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