Abstract
The activity of iron in liquid Au–Fe alloys, which range from pure gold to the composition saturated with a gold solid solution or a γ-iron solid solution, was measured in the temperature range of 1100°C to 1300°C by the application of distribution equilibria of iron between wüstite and molten alloys. The data reported by Darken and Gurry were used for the relation between the gas composition of CO2/CO over wüstite and the activity of iron in wüstite. The starting materials, pure gold plus Fe2O3 and Au–Fe alloys rich in iron, were exposed to the controlled gaseous atmosphere for 20 hr. Quenched samples were hammered into a plate and polished with emery paper. Iron contents of samples were determined by means of an X-ray fluorescent spectrometer. The activity data are summarized with the modified α functions, and the partial molar quantities are calculated from the modified α function.
