Solid-Solid-Liquid Equilibrium

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This Demonstration shows a solid-liquid phase diagram for two elements (A and B) that also form a solid compound (A2B3); elements A and B are immiscible in the solid phase. On the phase diagram, the vertical dashed line indicates the mole fraction of B in the liquid phase. The amounts of each phase (solid A, solid B, compound A2B3, and a liquid phase containing A and B) are shown in the bar graph on the right. The system contains one mole total. The mole fraction of B in the liquid phase is given on the liquid bar. Change the overall mole fraction of B with the slider. Change the temperature by using the "heat added" slider, although when the black point is on the horizontal lines at 200°C and 300°C, the temperature will not change until one solid phase melts (adding heat) or the liquid phase solidifies (removing heat). The amounts of each phase present are determined from mass balances. The amount of heat added is not meant to represent the value for a real system.


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