Journal of Phase Equilibria

, Volume 14, Issue 1, pp 22–30 | Cite as

Phase equilibria of the cu-in system II: Thermodynamic assessment and calculation of phase diagram

  • C. R. Kao
  • A. Bolccwage
  • S. -L. Chen
  • S. W. Chen
  • Y. A. Chang
  • A. D. Romig
Section I: Basic and Applied Research


The phases in the Cu-In binary were modelled thermodynamically using the Redlich-Kister expression for the Gibbs energies of the solution phases, the Wagner-Schottky model for those of the η (η)’)-Cu2ln phase (taking η and η)’ to be a single phase), and assuming line compound behavior for the other intermetallic phases. The model parameters were obtained using primarily the thermodynamic data, as well as the phase equilibrium data. The thermodynamic values for the various phases calculated from the models are in reasonable agreement with the experimentally determined thermodynamic data that are available in the literature. The entropies of melting for the intermetallic phases obtained from the models are in accord with the values calculated from the empirical formulas suggested by Kubaschewski.

The calculated phase diagram is also in reasonable agreement with the experimentally determined diagram, with the calculated temperatures for all the invariant equilibria within 1°C of the experimental values. The discrepancies between the calculated and experimental phase boundaries at the invariant temperatures are less than 1 at.% except those involving βCu4Inn and γCu7ln3. These two phases were taken to be line compounds in the present study, although experimentally they exist over appreciable ranges of homogeneity.


Gibbs Energy Phase Equilibrium Intermetallic Phasis Excess Gibbs Energy Thermodynamic Behavior 
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Copyright information

© ASM International 1993

Authors and Affiliations

  • C. R. Kao
  • A. Bolccwage
  • S. -L. Chen
  • S. W. Chen
    • 1
  • Y. A. Chang
  • A. D. Romig
    • 2
  1. 1.Department of Materials Science and EngineeringUniversity of Wisconsin-Madison
  2. 2.Materials and Process Sciences CenterSandia National Laboratories Albuquerque

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