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Calculation of metastable immiscibility region in the Al2O3–SiO2 system

Published online by Cambridge University Press:  31 January 2011

Takayuki Ban ,
Shigeo Hayashi ,
Atsuo Yasumori  and
Kiyoshi Okada
Takayuki Ban
Affiliation:
Department of Inorganic Materials, Tokyo Institute of Technology, O-okayama, Meguro, Tokyo 152, Japan
Shigeo Hayashi
Affiliation:
Department of Inorganic Materials, Tokyo Institute of Technology, O-okayama, Meguro, Tokyo 152, Japan
Atsuo Yasumori
Affiliation:
Department of Inorganic Materials, Tokyo Institute of Technology, O-okayama, Meguro, Tokyo 152, Japan
Kiyoshi Okada*
Affiliation:
Department of Inorganic Materials, Tokyo Institute of Technology, O-okayama, Meguro, Tokyo 152, Japan
*
b) Author to whom correspondence should be addressed.
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Abstract

Metastable liquid-liquid immiscibility region in the Al2O3–SiO2 system was calculated by a regular solution model using three sets of liquidus data from the stable phase diagrams reported. These calculations indicated that the immiscibility region was richer in Al2O3 composition than those reported before. A miscibility gap calculated using the liquidus data reported by Klug et al. [F. J. Klug, S. Prochazka, and R. H. Doremus, J. Am. Ceram. Soc. 70, 750 (1987)] (model A) ranged from 2.6 to 71 mol % Al2O3 at around 1000 °C, which was the most compatible result with the idea that metastable pseudotetragonal mullite crystallized at around 1000 °C became Al2O3-rich composition due to the immiscibility phase separation before mullitization among three sets of liquidus data.

Type
Articles
Information
Journal of Materials Research , Volume 11 , Issue 6 , June 1996 , pp. 1421 - 1427
Copyright
Copyright © Materials Research Society 1996

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