# Spinel deoxidation equilibrium in the cobalt-manganese-aluminum-oxygen system: Experiment and modeling

Jacob, Thomas K and Pandit, Shashidhara S (1987) Spinel deoxidation equilibrium in the cobalt-manganese-aluminum-oxygen system: Experiment and modeling. In: International Journal for Materials Research/Zeitschrift für Metallkunde, 78 (9). pp. 652-656.

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## Abstract

The concentration and chemical potential of O in molten Co-Mn alloys equilibrated with (Co, Mn)$Al_2O_4$ spinel solid solns. and $\alpha-Al_2O_3$ were detected at 1873 K as a function of Mn concentration Compostion of the equilibrim spinel phase was detected by using electron probe microanal. The effect of Mn on the activity coefficient of O in liquid Co was derived. The deoxidation equilibrium was computed by using data on the activity coefficient of O and Mn in liquit Co, Gibbs energies of formation of pure spinels, and published interaction parameters. The activity-compn. relation for the spinel solid soln. was derived from a cation distribution model. The computations were in agreement with exptl. data only when the activity coefficient of Mn was taken as 0.22, rather than 0.154 suggested in the literature.

Item Type: Journal Article Copyright of this article belongs to Hanser Publisher Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy) 13 Jun 2008 27 Aug 2008 13:26 http://eprints.iisc.ernet.in/id/eprint/14266