Institut für Gesteinshüttenkunde.
Thermodynamic Activities in B2O3-SiO2 Melts at 1475 K
Article first published online: 8 MAR 2005
Journal of the American Ceramic Society
Volume 76, Issue 11, pages 2809–2812, November 1993
How to Cite
Boike, M., Hilpert, K. and Müller, F. (1993), Thermodynamic Activities in B2O3-SiO2 Melts at 1475 K. Journal of the American Ceramic Society, 76: 2809–2812. doi: 10.1111/j.1151-2916.1993.tb04020.x
J. Shelby—contributing editor
- Issue published online: 8 MAR 2005
- Article first published online: 8 MAR 2005
- Manuscript No. 195579. Received June 18, 1992; approved January 15, 1993.
Eight glass samples in the B2O3-SiO2 system with compositions from 20 to 90 mol% B2O3 were prepared. The equilibrium vaporization was studied by Knudsen effusion mass spectrometry at temperatures between 1450 and 1500 K. B2O3 (g) was the most abundant boron-containing species in the vapor; no silicon-containing gaseous species were detected. Thermodynamic activities of B2O3 in the liquid were determined at 1475 K. Thermodynamic activities of SiO2 and integral excess Gibbs energies were estimated from the thermodynamic activities of B2O3. The thermodynamic data support the results obtained by other methods indicating the existance of a miscibility gap in the metastable liquid.