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Revision of thermodynamic data on MnO Al2O3 melts

Jacob, KT (1981) Revision of thermodynamic data on MnO Al2O3 melts. In: Canadian Metallurgical Quarterly, 20 (1). pp. 89-92.

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The high temperature region of the MnO-A1203 phase diagram has been redetermined to resolve some discrepancies reported in the literature regarding the melting behaviour of MnA1,04. This spinel was found to melt congruently at 2108 (+ 15) K. Theactivity of MnOin MnO-Al,03 meltsand in the two phase regions, melt + MnAI,04 and MnAI2O4 + A1203, has been determined by measuring the manganese concentration in platinum foils in equilibrium under controlled oxygen potentials. The activity of MnO obtained in this study for M ~ O - A I ,m~el~ts is in fair agreement with the results of Sharma and Richardson.However. the alumina-rich melt is found to be in equilibrium with MnAl,04 rather than AI2O3. as suggested by ~ha rmaan d Richardson. The value for the acthity of MnO in the M~AI ,O,+ A1,03 two phaseregion permits a rigorous application of the Gibbs-Duhem equation for calculating the activity of A1203 and the integral Gibbs' energy of mixing of MnO-A1203 melts, which are significantly different from those reported in the literature.

Item Type: Journal Article
Publication: Canadian Metallurgical Quarterly
Publisher: Canadian Institute of Mining, Metallurgy and Petroleum
Additional Information: Copyright of this article belongs to Canadian Institute of Mining, Metallurgy and Petroleum.
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 05 Dec 2011 06:28
Last Modified: 05 Dec 2011 06:28
URI: http://eprints.iisc.ac.in/id/eprint/42517

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