Borate Glasses pp 567-575 | Cite as

Effect of Water Content on Density, Refractive Index, and Transformation Temperature of Alkali Borate Glasses

  • Helmut Franz
Part of the Materials Science Research book series (MSR, volume 12)


The solubility of water vapor in boric oxide [1] and binary alkali borate melts [2] 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 [2] and alkali silicate [7] 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 [8]. 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.


Refractive Index Transformation Temperature Interstitial Space Borate Glass Infrared Absorption Spectrum 
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Copyright information

© Plenum Press, New York 1978

Authors and Affiliations

  • Helmut Franz
    • 1
  1. 1.Glass Research CenterPPG INDUSTRIES, Inc.PittsburghUSA

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