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1. A bulk composition of X cools to the liquidus, at which point An crystallizes. 2. Continued crystallization of An causes liquid composition to move toward Di.
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1. A bulk composition of X cools to the liquidus, at which point An crystallizes. 2. Continued crystallization of An causes liquid composition to move toward Di. 3. When T=1274°C, liquid has moved to eutectic; Di begins to crystallize. No change in temperature or composition of any of the 3 phases is permitted until the liquid has completely crystallized. 4. At temperatures below 1274°C, only crystals of An and Di are present. X