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Stability of Hercynite at High Temperatures
Author(s) -
PILLAY T. C. M.,
D'ENTREMONT JOHN,
CHIPMAN JOHN
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.tb13620.x
Subject(s) - corundum , spinel , feal , atmospheric temperature range , materials science , gibbs free energy , mineralogy , thermodynamics , metallurgy , analytical chemistry (journal) , chemistry , environmental chemistry , physics , intermetallic , alloy
The free energy of formation of the spinel FeAl 2 O 4 from its constituent oxides has been determined in the temperature range 1550° to 1700°C. The method used involved determination of the gas ratio P aiO /p H2 in equilibrium with liquid iron, corundum, and hercynite and previously published data on the same gas equilibrium with liquid iron and FeO. The values of AF° at 1550° and 1700°C. are respectively ‐3690 and – 3490 cal. per mole.