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Activity coefficient of AgO0.5 in PbO-SiO2 melt equilibrated with Ag-Pb alloy in an alumina or a magnesia crucible was investigated at 1273 K. A chemical equilibrium technique was applied to the measurement. The oxygen partial pressure was also measured by an EMF method. The activity coefficient of AgO0.5 in the PbO-SiO2 melt was derived.The addition of SiO2 in the PbO melt decreases dissolution of Ag into the oxide phases. However, the activity coefficient of AgO0.5 increases slightly with an increase in the concentration of SiO2 in the PbO melt.

Activity Coefficient of AgO<SUB>0.5</SUB> in the PbO-SiO<SUB>2</SUB> Melt at 1273 K