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Phase Diagram of the System BaO‐Fe 2 O 3
Author(s) -
GOTO YASUMASA,
TAKADA TOSHIO
Publication year - 1960
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.1151-2916.1960.tb14330.x
Subject(s) - phase diagram , solid solution , melting point , analytical chemistry (journal) , oxygen , dissociation (chemistry) , partial pressure , materials science , diffraction , atmospheric pressure , phase (matter) , chemistry , thermodynamics , mineralogy , metallurgy , physics , oceanography , organic chemistry , chromatography , geology , optics , composite material
The phase diagram of the system BaO‐Fe 2 0 3 was determined by X‐ray diffraction, melting‐point measurement, and microscopic methods. Since the reduction of Fe 3+ to Fe 2+ was observed by chemical analysis in the samples heated at high temperature, especially in molten samples, the samples were heated at 1 atmosphere pressure of oxygen in the temperature region in which the liquid was in equilibrium; 1 atmosphere pressure of oxygen was su5cient to restrain the reduction of Fe 3+ . In the temperature region of solid‐solid equilibrium, the dissociation was not observed even when the samples were heated in air. BaO ‐ 6Fe 2 O 3 formed a solid solution with BaO.Fe 2 0 3 . The BaO:Fe 2 0 3 ratio of the solid solution was BaO.4.5Fe 2 0 3 at 1350°C. and BaO. 5.0Fe 2 0 a at 800°C. The precipitation micro‐structures of each primary solid solution were observed.