Activity Coefficient of Strontium in Liquid Copper and the Standard Free Energy of Formation for SrO·6Al₂O₃ and SrO·2Al₂O₃

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The activity coefficient of strontium in a copper melt has been investigated by a chemical equilibrium technique in the temperature range from 1473 to 1773 K. A graphite crucible was used to control the oxygen partial pursuer in CO gas. The activity coefficient was derived from the standard free energy of formation of SrO, the oxygen partial pressure, and the concentration of strontium in copper.
The standard free energies of formation for SrO·6Al₂O₃ and SrO·2Al₂O₃ at 1723 K are also derived by equilibrating Al₂O₃, SrO·6Al₂O₃, and SrO·2Al₂O₃ with Cu.