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Thermodynamics of the liquid Co-Cu system and calculation of phase diagram

  • Jaroslav Kubišta
  • Jan Vřešt’ál
Basic And Applied Research

Abstract

Knudsen-cell mass spectrometric measurements have been carried out in the liquid phase of the Co-Cu system in the concentration range 25.0 to 85.9 at. % Cu in the temperature range 1347 to 1587 °C. The molar excess Gibbs energy, enthalpy and entropy of mixing, as well as the thermodynamic activities of components in the liquid Co-Cu system were determined using the composition and temperature dependence of the ratio of intensities of 59Co and 63Cu ions. The results show that a subregular solution model would fit measured data well (2-parameter thermodynamically adapted power (TAP) series: C n H in J·mol−1; C 1 H =35,961, C 2 H =−5573.2; C n S in J·mol−1·K−1; C 1 S =5.54, C 2 S =−3.35). A special experiment verified solid-liquid phase equilibrium at 1327 °C and the phase diagram was calculated.

Keywords

Excess Gibbs Energy Phase Diagram Calculation Molar Excess Gibbs Energy Thick Full Line Thin Full Line 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© ASM International 2000

Authors and Affiliations

  • Jaroslav Kubišta
    • 1
  • Jan Vřešt’ál
    • 1
  1. 1.Institute of Theoretical and Physical Chemistry, Fac. Sci.Masaryk University BrnoBrnoCzech Republic

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