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Unary and Binary Phase Diagrams

Explore Unary phase diagrams for materials like water, silica, and carbon, understanding the phase rule, and terminology like snowflake obsidian. Learn about applications such as climate change and greenhouse warming on terrestrial planets.

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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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