Binary_Phase_Diagrams_F10

Binary_Phase_Diagrams_F10 - Binary Phase Diagrams GLY 4200...

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1 Binary Phase Diagrams GLY 4200 Fall, 2010
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2 Binary Diagrams Binary diagrams have two components We therefore usually choose to plot both T (temperature) and X (composition) with pressure held constant P-X (T fixed) or P-T (X fixed) are also possible
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3 Binary System Examples Binary solid solution - olivine, plagioclase feldspar Binary eutectic with congruent melting - potassium feldspar - silica Binary peritectic and eutectic with solid to solid conversion - leucite - Potassium feldspar - silica Binary minimum melting point - potassium feldspar - albite Binary minimum melting point with solvus - potassium feldspar - albite
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4 Phase Rule for Binary Systems f = c - p + 2 = 2 - p + 2 = 4 - p If two phases are present, there are two degrees of freedom (both T and X) If three phases are present, there is one degree of freedom (either T or X)
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5 Binary Solid Solution Plagioclase Feldspar series, 39% of the earth’s crust
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6 Phase Rule Application How many degrees of freedom are present at points 1,2, and 3?
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7 Binary Eutectic Diagram Conventions • Two immiscible components: such as CaAl
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Binary_Phase_Diagrams_F10 - Binary Phase Diagrams GLY 4200...

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