Thermodynamic activities in B[sub 2]O[sub 3]-SiO[sub 2] melts at 1,475 K

Journal Article · Mon Nov 01 04:00:00 EST 1993 · Journal of the American Ceramic Society; (United States)

DOI:https://doi.org/10.1111/j.1151-2916.1993.tb04020.x· OSTI ID:5604639

Boike, M; Mueller, F ^[1]; Hilpert, K ^[2]

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1. Inst. fuer Gesteinshuettenkunde, Aachen (Germany)
2. Inst. fuer Werkstoffe der Energietechnik, Juelich (Germany)

Eight glass samples in the B[sub 2]O[sub 3]-SiO[sub 2] system with compositions from 20 to 90 mol% B[sub 2]O[sub 3] were prepared. The equilibrium vaporization was studied by Knudsen effusion mass spectrometry at temperature between 1,450 and 1,500 K. B[sub 2]O[sub 3](g) was the most abundant boron-containing species in the vapor; no silicon-containing gaseous species were detected. Thermodynamic activities of B[sub 2]O[sub 3] in the liquid were determined at 1,475 K. Thermodynamic activities of SiO[sub 2] and integral excess Gibbs energies were estimated from the thermodynamic activities of B[sub 2]O[sub 3]. The thermodynamic data support the results obtained by other methods indicating the existence of a miscibility gap in the metastable liquid.

• OSTI ID: 5604639
• Journal Information: Journal of the American Ceramic Society; (United States), Journal Name: Journal of the American Ceramic Society; (United States) Vol. 76:11; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360606* -- Other Materials-- Physical Properties-- (1992-)
BORON COMPOUNDS
BORON OXIDES
CHALCOGENIDES
GLASS
OXIDES
OXYGEN COMPOUNDS
SILICON COMPOUNDS
SILICON OXIDES
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE
TEMPERATURE RANGE 1000-4000 K
THERMODYNAMIC ACTIVITY