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Unary and Binary Phase Diagrams

Unary and Binary Phase Diagrams. GLY 4200 Fall, 2012. Unary Diagrams. Unary diagrams have a single component We therefore usually choose to plot both P (pressure) and T (temperature) since composition is not a variable Examples Water Silica Carbon. Phase Rule for Unary Systems.

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Unary and Binary Phase Diagrams

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  1. Unary and Binary Phase Diagrams GLY 4200 Fall, 2012

  2. Unary Diagrams • Unary diagrams have a single component • We therefore usually choose to plot both P (pressure) and T (temperature) since composition is not a variable • Examples • Water • Silica • Carbon

  3. Phase Rule for Unary Systems • f = c - p + 2 = 1- p + 2 = 3 - p • If one phase is present, there are two degrees of freedom (both T and P) • If two phases are present, there is one degree of freedom (either T or P) • If three phases are present, there are no degrees of freedom

  4. H2O Diagram

  5. Terminology

  6. Water ice

  7. Silica Phase Diagram

  8. Snowflake Obsidian • The white patches are crystals of cristobolite, formed at high temperature • The magma-crystal mix then erupted, chilling the magma and forming a volcanic glass matrix around the metastable cristobolite, which cooled too quickly to revert to tridymite

  9. Carbon Phase Diagram

  10. Climate Change Application • Greenhouse Warming on Terrestrial Planets

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