Ternary Phase Diagrams: Crystallization in Ternary Systems. %Melt Comp. Note that composition is measured along the sides of the basal triangle and temperature (or pressure) is measured vertically. Consider an example involving the three components diopside, anorthite and albite (i.e., there are two phases: diopside and a solid solution of plagioclase). There are several features of this diagram … Unformatted text preview: Phase Diagrams 1600 a Liquid 1500 1500 T oC b c 1392 Diopside + Liquid plus Liquid Plagioclase u 80 lid o S s Di 20 1557 1274 o T C 1300 Diopside + Anorthite 1200 idus u q i L Liquid Anorthite + Liquid 1400 Plagioclase 1400 1300 1553 idus Liqu 40 60 1200 Wt.% Anorthite An 1118 1100 Ab 20 40 60 Weight % An 80 An Plan Topics: melting - How to melt - Phase … Multi-component phase relationships can be visualized on a triangular ternary plot. Figure 6-6 . Vol. Melt … A eutectic phase diagram is found if the Gibbs potential of the solid phase with a miscibility gap becomes larger than the Gibbs potential of the liquid phase. Vol. % Melt Melt Comp. T1 T3 T2 T4 100 64 57 0 70An+30Di 53An+47Di 47An+53Di NA 20 40 60 80 0.0 36 43 100 N/A An An 70An+30Di T3 Magma Chamber An+Di groundmass An phenocrysts Di+An Binary System. wt., Di = 0.2166 kg, An= 0.2782 kg), and plot a binary phase diagram for the system diopside-anorthite (T in °C versus composition in wt.%). The conventions for the phase diagram include the following (illustration below): Two components: high temperature CaAl 2 Si 2 O 8 (anorthite) and low temperature NaAl 2 Si 2 O 8 (albite) plotted along the horizontal axis. Figure 5-6. (b) Recalculate mole fractions into weight percent (mol. The relation between the eutectic phase diagram and the g-plots for several temperatures is shown in Fig. M NaAlSi3O8 CaAl 2Si2O8 T1 T3 T3 An67 55% An87 An95 45% Ab An An32 Binary Solid Solution Phase Diagram Temp. Consider an example involving the three components diopside, anorthite and albite (i.e., there are two phases: diopside and a solid solution of plagioclase). I. Equilibrium Crystallization Where all 2 Component Systems are Binary Eutectic Systems. First we will repeat some basics about labeling phases. NOTE that anorthite crystallizes at a much higher temperature than albite, just what we expect from Bowen's reaction series. Figure 1 shows a three dimensional representation of the three component (ternary) system ABC. % Solid Solid Comp. 2.13. What are the temperature and composition of the eutectic? As usual homogeneous phases are labeled by Greek characters. Diopside Anorthite Temp.

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