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Related Experiment Videos

Effective kinetic phase diagrams.

Jan H Los1, Marija Matovic

  • 1IMM Laboratory of Solid State Chemistry, Radboud University Nijmegen, Toernooiveld, 6525 ED Nijmegen, The Netherlands.

The Journal of Physical Chemistry. B
|July 21, 2006
PubMed
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Solid solution growth away from equilibrium is kinetically controlled, not thermodynamically. This study develops effective kinetic phase diagrams considering mass and heat transport, revealing material-dependent segregation behaviors.

Area of Science:

  • Materials Science
  • Physical Chemistry
  • Thermodynamics

Background:

  • Solid solution composition during non-equilibrium growth deviates from equilibrium predictions.
  • Kinetics, including surface reactions and transport phenomena, dictates the growth composition.
  • Previous models established kinetic phase diagrams based on surface kinetics and undercooling.

Purpose of the Study:

  • To extend the kinetic model for solid solution growth to incorporate mass and heat transport.
  • To develop effective kinetic phase diagrams that account for both kinetic and transport effects.
  • To analyze the influence of different transport mechanisms on segregation across various material classes.

Main Methods:

  • Formulation of a kinetic model incorporating mass and heat transport to the solidification front.

Related Experiment Videos

  • Development of effective kinetic phase diagrams based on the extended model.
  • Systematic scanning of parameter space for metals, semiconductors, and molecular systems.

    • Main Results:

    • Effective kinetic phase diagrams reveal distinct segregation behaviors influenced by transport processes.
    • Mass transport limitations are dominant in metals and semiconductors.
    • Interfacial undercooling and heat transport limitations are more significant in molecular mixtures.

    Conclusions:

    • Non-equilibrium solid solution growth is governed by a complex interplay of kinetics and transport.
    • Effective kinetic phase diagrams provide crucial insights into growth composition prediction.
    • Material-specific transport phenomena dictate the relative importance of kinetic and transport effects on segregation.