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Thermodynamic properties of solid Pt-Mn, Pt-Cr, and Pt-MnCr alloys at 1500 °C

Journal Article


Abstract


  • Equations for the activity coefficients of manganese and chromium in platinum at 1500 °C were determined from activity-composition relations in the Pt-Mn, Pt-Cr, and Pt-Mn-Cr systems. This was done by equilibrating platinum wire with, respectively, MnO, Cr2O3, and an equimolar mixture of Cr2O3 and (Mn, Cr)3O4, under oxygen partial pressures that ranged from 10-6.5 to 10-10.0 atm. It was found that equations for the activity coefficients can be represented by Darken's quadratic formalism. The experimental data confirmed that the Pt-Mn, Pt-Cr, and Pt-Mn-Cr alloys studied show strong negative deviations from ideality, as is expected from the respective phase diagrams.

Publication Date


  • 1997

Citation


  • Garbers-Craig, A. M., & Dippenaar, R. J. (1997). Thermodynamic properties of solid Pt-Mn, Pt-Cr, and Pt-MnCr alloys at 1500 °C. Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science, 28(4), 547-552. doi:10.1007/s11663-997-0027-1

Scopus Eid


  • 2-s2.0-0031209828

Web Of Science Accession Number


Start Page


  • 547

End Page


  • 552

Volume


  • 28

Issue


  • 4

Abstract


  • Equations for the activity coefficients of manganese and chromium in platinum at 1500 °C were determined from activity-composition relations in the Pt-Mn, Pt-Cr, and Pt-Mn-Cr systems. This was done by equilibrating platinum wire with, respectively, MnO, Cr2O3, and an equimolar mixture of Cr2O3 and (Mn, Cr)3O4, under oxygen partial pressures that ranged from 10-6.5 to 10-10.0 atm. It was found that equations for the activity coefficients can be represented by Darken's quadratic formalism. The experimental data confirmed that the Pt-Mn, Pt-Cr, and Pt-Mn-Cr alloys studied show strong negative deviations from ideality, as is expected from the respective phase diagrams.

Publication Date


  • 1997

Citation


  • Garbers-Craig, A. M., & Dippenaar, R. J. (1997). Thermodynamic properties of solid Pt-Mn, Pt-Cr, and Pt-MnCr alloys at 1500 °C. Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science, 28(4), 547-552. doi:10.1007/s11663-997-0027-1

Scopus Eid


  • 2-s2.0-0031209828

Web Of Science Accession Number


Start Page


  • 547

End Page


  • 552

Volume


  • 28

Issue


  • 4