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 

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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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