Abstract
The standard Gibbs free energies of the following reactions: Co + 1 2 O 2 ⇄ CoO (1) and 3CoO + 1 2 O 2 ⇆ Co 3O 4 (2) have been calculated from the e.m.f. measurements carried out using a simple compartment solid state galvanic cell, as well for the reaction: 3 Co + 20 2 ⇆ Co 3 O 4 (3) The temperature-equilibrium oxygen partial pressure relationship has been evaluated. A phase diagram for Co, CoO and Co 3O 4 is proposed in the temperature range 600–900 °C. A statistical analysis on reported ΔG f 0 values at 1100 K for reaction (1) has been performed and the results are discussed.
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