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Applied Geochemistry & Lab Ch.1 Phase Equilibria in a Simple System

JYU. Applied Geochemistry & Lab Ch.1 Phase Equilibria in a Simple System. AIMS. Studying the basic principles of Understanding equilibrium assemblage under a certain T, P, X Estimating T, P, and X from the equilibrium assemblages Determining if it’s really in equilibrium. 1. DEFINITIONS.

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Applied Geochemistry & Lab Ch.1 Phase Equilibria in a Simple System

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  1. JYU Applied Geochemistry & LabCh.1 Phase Equilibria in a Simple System

  2. AIMS • Studying the basic principles of • Understanding equilibrium assemblage under a certain T, P, X • Estimating T, P, and X from the equilibrium assemblages • Determining if it’s really in equilibrium

  3. 1. DEFINITIONS • Phase (P): A part of the system, which is physicochemically homogeneous and mechanically separable from the rest. • Component (C): An operator consisting of the minimum number of the operators being capable of representing the compositions of all the phases in the system • Depending on the # of C  Unary, binary, ternary, quaternary system, …… • Degree of Freedom (F): The minimum # of the independent variable required to define the state of the system. • Depending on the # of F  bi(di)variant field, univariant curve, invariant pt.

  4. 2. Gibbs’ Phase Rule • P + F = C + 2 (for two independent variable system) Can you tell P, C, and T in the following examples? Can you apply the phase rule?

  5. http://serc.carleton.edu/research_education/equilibria/phaserule.htmlhttp://serc.carleton.edu/research_education/equilibria/phaserule.html

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