Activity coefficient of strontium in liquid copper and the standard free energy of formation for SrO・6Al2O3 and SrO・2Al2O3

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  • Ueda Shigeru
    Faculty of Engineering, Iwate University Institute of Multidisciplinary Research for Advanced Materials, Tohoku University
  • Utagawa Keita
    Faculty of Engineering, Iwate University Institute of Multidisciplinary Research for Advanced Materials, Tohoku University
  • Yamaguchi Katsunori
    Faculty of Engineering, Iwate University

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  • Activity Coefficient of Strontium in Liquid Copper and the Standard Free Energy of Formation for SrO·6Al<SUB>2</SUB>O<SUB>3</SUB> and SrO·2Al<SUB>2</SUB>O<SUB>3</SUB>
  • Activity Coefficient of Strontium in Liquid Copper and the Standard Free Energy of Formation for SrO&middot;6Al<SUB>2</SUB>O<SUB>3</SUB> and SrO&middot;2Al<SUB>2</SUB>O<SUB>3</SUB>

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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.<BR>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.

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