Abstract

The oxygen partial pressures of the equilibrium among solid magnesia, phosphorus‐containing liquid copper and trimagnesium phosphate were measured by means of solid‐oxide galvanic cells. These cells incorporated magnesia‐stabilized zirconia as solid electrolyte and Mo + MoO2 as reference electrode at 1 473, 1 523 and 1 573 K. Then the activities of phosphorus in liquid copper, and the free energy of dissolution of diatomic phosphorus gas into liquid copper at infinite dilution refered to 1 wt.pct. were determined.

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