Equilibrium Studies of the System'(Fe,Co)O'–(Fe,Co)3O4 by Solid-State emf Measurements in the Temperature Range 970 to 1370 K |
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| Authors: | Mats Lundberg Erik Rosén |
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| Affiliation: | Department of Inorganic Chemistry, University of Umeå, S-901 87 Umeå, Sweden |
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| Abstract: | The equilibrium reaction 3'(Fe, Co)O'( ss ) +1/2O2 ( g ) ? (Fe, Co)3O4( ss ) was studied in the temperature range 970 to 1370 K for seven different total compositions of molar ratios 0.5 < Fe/(Fe + Co) ≤ 1.0. The equilibrium pressures of oxygen were determined by using galvanic cells incorporating calcia stabilized zirconia as solid electrolyte and the Fe/Co ratios in the solid-solution phases by wavelength dispersive spectrometry microprobe analyses. The activities of 'FeO' in the cobaltowüstite phase were then derived from the experimental results obtained. |
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| Keywords: | cobalt oxide iron oxides solid solutions phase equilibria electromotive force |
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