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Phase Equilibria and Thermodynamics in the Al 2 O 3 –SiO 2 System—Modeling of Mullite and Liquid
Author(s) -
Mao Huahai,
Selleby Malin,
Sundman Bo
Publication year - 2005
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2005.00440.x
Subject(s) - mullite , phase diagram , thermodynamics , materials science , mineralogy , phase (matter) , chemistry , metallurgy , physics , ceramic , organic chemistry
The Al 2 O 3 –SiO 2 system has been reassessed using a solution model for mullite extending from sillimanite to a hypothetical state of alumina. The property of sillimanite, to be used to describe one of the end‐members, was extracted from an analysis of the T – P phase diagram for Al 2 SiO 5 polymorphs. It was possible to represent the information on the range of stability of mullite, including some showing that mullite extends to higher SiO 2 contents than represented by the composition of 3:2 mullite. An attempt was made to model the liquid with the ionic two‐sublattice model using a new species AlO 2 −1 . The pressure dependence of Al 2 SiO 5 polymorphs was optimized by a new model recently implemented in Thermo‐Calc.