Effect of Water Content on Density, Refractive Index, and Transformation Temperature of Alkali Borate Glasses
The solubility of water vapor in boric oxide  and binary alkali borate melts  has been found to be proportional to the square root of the partial pressure PH2O, indicating that water vapor introduced at PH20< 1 atm is dissolved in the form of hydroxyl groups (−OH), in analogy to the incorporation of water in silicate melts [3–6]. Correlations between the bond state of dissolved hydroxyl groups and the structure of alkali borate  and alkali silicate  glasses have been derived from solubility data and infrared absorption spectra. The effect of water content on some properties of silicate glasses have been discussed previously . This study will present experimental data on the effect of the hydroxyl concentration on density, refractive index, and transformation temperature of binary lithium, sodium, and potassium borate glasses containing 0 to 33 mole percent R20. The corresponding properties of water-free alkali borate glass systems have been extrapolated. Results are discussed in terms of a simplified structural model interpreting the effects of incorporated hydroxyl groups on structure sensitive properties of alkali borate glasses.
KeywordsRefractive Index Transformation Temperature Interstitial Space Borate Glass Infrared Absorption Spectrum
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