The writer is research scientist, Max-Planck-Institut für Silikatforschung.
Solubility of Water Vapor in Alkali Borate Melts
Article first published online: 2 JUN 2006
Journal of the American Ceramic Society
Volume 49, Issue 9, pages 473–477, September 1966
How to Cite
FRANZ, H. (1966), Solubility of Water Vapor in Alkali Borate Melts. Journal of the American Ceramic Society, 49: 473–477. doi: 10.1111/j.1151-2916.1966.tb13302.x
Presented at the Sixty-Seventh Annual Meeting, The American Ceramic Society, Philadelphia, Pa., May 4, 1965 (Symposium No. 3; No. 5–S3–65).
- Issue published online: 2 JUN 2006
- Article first published online: 2 JUN 2006
- Received June 1, 1965; revised copy received February 3, 1966.
The solubility of water vapor at 750° to 1050°C was determined for alkali borate melts containing 0 to 40 mole % Li2O, Na2O, or K2O. In all cases the solubility in these melts is linearly proportional to the square root of the H2O partial pressure. At pH2O = 1 atm and T= 900°C, o.5 to 2.2 mole % H2O are dissolved in the melts in equilibrium. In the potassium borate melts a minimum of solubility was observed at about 25 mole % K2O; in the sodium borate melts the minimum was at 35 to 40 mole % Na2O. In the lithium borate melts a minimum of solubility was not reached in the range of compositions investigated. These results are discussed in terms of a concept for the acid-base properties of melts and glasses in which the position of the solubility minimum corresponds to the “neutral point” of an acidity-basicity scale. Some corroborating qualitative observations concerning the evaporation of components from the glass melts and the chemical resistivity of the corresponding solid glasses are discussed.