Based on the phase diagram of a ceramic based on the SiO2/Al2O3 system, indicate which statement is correct. (A). If a sample of liquid ceramic containing 30% Al2O3 is cooled to a temperature between 1800 and 1600°C, a mullite with the same Al2O3 mole fraction precipitates. (B). At 1400°C, a ceramic will always be less mullite-rich the higher the overall Al2O3 mole fraction. (C). Cristobalite is never stable above 1600°C. (D). In the eutectic of the system, the proportion of mullite is much lower than that of cristobalite. temperature (°C) 2100 2000 L + 1900 cristobalite alúmina + L 1800 1700 mullite L+ mullite 1600 1500 mullite + alúmina + 1400 cristobalite mullite 1300 1200 0 10 20 30 40 50 60 70 80 90 100 SiO2 molar fraction Al2O3 Al2O3

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