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Phase Equilibrium in the System MgO‐H 2 O at High Temperatures and Very High Pressures
Author(s) -
YAMAOKA SHINOBU,
FUKUNAGA OSAMU,
SAITO SHINROKU
Publication year - 1970
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.1151-2916.1970.tb12066.x
Subject(s) - brucite , extrapolation , quenching (fluorescence) , materials science , phase (matter) , high pressure , thermodynamics , periclase , analytical chemistry (journal) , mineralogy , chemistry , metallurgy , chromatography , physics , magnesium , mathematical analysis , mathematics , organic chemistry , quantum mechanics , fluorescence
Phase equilibrium in the system MgO‐H 2 O was investigated from 500° to 1450° C at 5 to 40 kbars by a quenching technique using a piston‐cylinder apparatus. Brucite decomposed to periclase plus vapor at 810° and 10 kbars, 945° and 20 kbars, 1000° and 32 kbars, and 975°C and 40 kbars. The slope of the decomposition P‐T curve became steeper with increasing pressure, infinite at 32 ‐ kbars and 1000C, and then negative above 32 kbars. The extrapolation of this curve to lower pressures agrees well with data of other workers who used hydrothermal techniques.