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Subsolidus Reactions in Oxide Systems in the Presence of Water at High Pressures
Author(s) -
OSBORN E. F.
Publication year - 1953
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.1151-2916.1953.tb12855.x
Subject(s) - forsterite , hydrothermal circulation , mullite , phase (matter) , mineralogy , dolomite , aqueous solution , oxide minerals , chemical engineering , chemistry , thermodynamics , chemical reaction , materials science , metallurgy , ceramic , biochemistry , physics , organic chemistry , engineering
Phase equilibrium studies at subsolidus temperatures, made in the presence of an aqueous phase at high pressures, are briefly reviewed for the systems eucryptite–silica, Al 2 O 3 –Ga 2 O 3 , MgAl 2 O 4 –Al 2 O 3 , and TiO 2 . Low‐temperature equilibrium relations have been largely clarified for the first three systems because of the greatly increased reaction rate in the presence of a fluid phase. For the system TiO 2 , however, hydrothermal techniques appear to be inadequate for the determination of stability relations. The hydrothermal syntheses of forsterite at 500° to 700°C. from magnesia and silica or from dolomite and silica, and of mullite at 500°C. from clay minerals, are mentioned as reactions of possible industrial significance. A further acceleration of reaction rate at low or moderate temperatures is being achieved by grinding at elevated temperatures and pressures.