Interactive Self-Study Module: Solid-Solid-Liquid Phase Diagrams
Department of Chemical and Biological Engineering, University of Colorado Boulder 

This module uses screencasts and interactive simulations to explain phase changes on a solid-solid-liquid phase diagram and utilizes the lever rule to determine the relative fraction of each component in each phase. It then provides example problems to allow the user to test themselves. We suggest using the learning resources in the following order:

  1. Attempt to answer the multiple-choice ConcepTest and solve the example problem before watching the screencasts or working with the simulations.
  2. Watch the screencasts that describe the phase diagrams and answer the questions within the screencasts.
  3. Use the two interactive simulations to further understand the behavior of the phase diagrams.
  4. Try to solve the two example problems before watching the solutions in the screencasts.
  5. Answer the ConcepTests.
        This module is intended for a thermodynamics course or a materials course. 

Before studying this module, you should:

After studying this module, you should be able to:
  1. Given temperature and mole fraction, use solid-solid-liquid phase diagrams to identify which phases are present.
  2. Identify regions where phase changes occur on a phase diagram.   
  3. Be able to draw and label a solid-solid-liquid phase diagram.