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Spinel deoxidation equilibria in the Fe—Mn—Al—O system – experiment and computation
Author(s) -
Pandit S. Shashidhara,
Jacob K. Thomas
Publication year - 1987
Publication title -
steel research
Language(s) - English
Resource type - Journals
eISSN - 1869-344X
pISSN - 0177-4832
DOI - 10.1002/srin.198701511
Subject(s) - spinel , manganese , oxygen , chemistry , microanalysis , solid solution , phase (matter) , electron probe microanalysis , composition (language) , thermodynamics , chemical composition , analytical chemistry (journal) , inorganic chemistry , electron microprobe , metallurgy , mineralogy , materials science , linguistics , philosophy , physics , organic chemistry , chromatography
The concentration and chemical potential of oxygen in liquid Fe—Mn alloys equilibrated with the spinel solid solution, (Fe, Mn)Al 2+2x O 4+3x , and α‐Al 2 O 3 have been determined at 1873 K as a function of manganese concentration. The composition of the spinel phase has been determined using electron probe microanalysis. The results are compared with data reported in the literature. The deoxidation equilibrium has been computed using data on free energy of solution of oxygen in liquid iron, free energies of formation of hercynite and galaxite, and interaction parameters reported in the literature. The activity‐composition relationship in spinel solid solution was derived from a cation distribution model. The model is in excellent agreement with the experimental data on oxygen concentration and potential and the composition of the spinel phase.