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Microstructural Study of Phase Equilibria in the Fe‐Ca‐O System Involving CaFe 5 O 7
Author(s) -
Bergman Bill,
Song Chengyi
Publication year - 1989
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.1151-2916.1989.tb07653.x
Subject(s) - eutectic system , wüstite , phase diagram , decomposition , thermodynamics , phase (matter) , diagram , materials science , melting temperature , oxygen , mineralogy , metallurgy , chemistry , microstructure , physics , mathematics , composite material , organic chemistry , hematite , statistics
By microscopic studies it is found that CaFe 5 O 7 (often represented by CW 3 F) does not disappear by decomposition to three solid phases at about 1050°C, as suggested by previous phase diagrams. Instead it disappears by melting at about 1100°C. On cooling, part of the liquid solidifies to a eutectic structure, wustite + Ca 2 Fe 2 O 5 (often represented by C 2 F). A revision of Turkdogan's oxygen potential–temperature diagram is proposed in order to account for the new information.