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— We present results of an 11B and 29Si nuclear magnetic resonance (NMR) spectroscopy study of the local anion structure of a series of borosilicate glasses in the Rb2O–B2O3–SiO2 system with different R = [Rb2O]/[B2O3] and K = [SiO2]/[B2O3] molar ratios. Relative integrated intensities of NMR lines are used to evaluate the fractions of boron atoms in three- and fourfold coordinations and the concentrations...
The local structure of cesium-borosilicate glasses with various Cs2O and B2O3 proportions and constant SiO2 content (50 mol %) is studied with 11B, 29Si, and 133Cs MAS NMR spectroscopy. The portions of three- and four-fold Si atoms are determined, as well as the concentrations of various silicate Qn units. Our experimental data are compared with the predictions of Dell’s model and thermodynamic modeling...
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