Activity Coefficient of Strontium in Liquid Copper and the Standard Free Energy of Formation for SrO・6Al_2O_3 and SrO・2Al_2O_3
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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·6Al<SUB>2</SUB>O<SUB>3</SUB> and SrO·2Al<SUB>2</SUB>O<SUB>3</SUB> at 1723 K are also derived by equilibrating Al<SUB>2</SUB>O<SUB>3</SUB>, SrO·6Al<SUB>2</SUB>O<SUB>3</SUB>, and SrO·2Al<SUB>2</SUB>O<SUB>3</SUB> with Cu.
- Materials Transactions, JIM
Materials Transactions, JIM 49(6), 1338-1341, 2008-06-01
The Japan Institute of Metals and Materials