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Si‐C‐O‐N High‐Pressure Equilibria and Δ G f o for Si 2 ON 2
Author(s) -
EKELUND MAGNUS,
FORSLUND BERTIL,
ERIKSSON GUNNAR,
JOHANSSON THOMAS
Publication year - 1988
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.1151-2916.1988.tb07565.x
Subject(s) - nitrogen , analytical chemistry (journal) , phase (matter) , carbon fibers , compounds of carbon , high pressure , materials science , chemistry , mineralogy , thermodynamics , chemical reaction , physics , organic chemistry , composite number , composite material , biochemistry , chromatography
Phase relations in the Si‐C‐O‐N system were studied by subjecting mixtures of carbon and silica (C/SiO 2 = 2 to 3) to high temperatures (up to 2000 K) and elevated nitrogen pressures (0.5 to 2.0 MPa) in a gas autoclave. The condensed‐phase assemblages obtained at different temperatures, pressures, and N/Si ratios are reported and compared with thermodynamic calculations. Values of Δ G f o (Si 2 ON 2 ) consistent with the experimental data are ‐397 kJ/mol at 1780 K and ‐369 kJ/mol at 1890 K. The influence on the synthesis of seeding the starting material is discussed.