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Engineering LibreTexts

25.12: Summary

  • Page ID
    32785
  • In the preceding pages we have seen that the standard free energy change for a reaction is a very useful quantity to know, in that its value affects the equilibrium constant and gives composition of the system.

    We have also seen that the Ellingham diagram is a convenient way of displaying the standard free energy change of many reactions at different temperatures. We have also seen how to read the value of pO2 from the Ellingham diagram.

    Finally, we have seen how the Ellingham diagram is used in extraction metallurgy to find the conditions needed for reduction of metal ores.

    Going further

    Books

    • D.R. Gaskell, "Introduction to the Thermodynamics of Materials" (Taylor and Francis, 1995) Third ed.
      Provides a good treatment of the Ellingham diagrams pp.347-395.
    • E.T. Turkdogan, "Physical Chemistry of High Temperature Technology" by (Academic Press, 1980)
      Main data source for the interactive diagram and deals with the physical chemistry of iron and steelmaking in ch.9.
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