Question: In the system Al 2 O 3 BaO, five phases stable above 1300 C were identified: AlO3, Al12 BaO19, Al-BaO4, Al-Ba306, and BaO. Each was

In the system Al₂O₃–BaO, five phases stable above 1300 °C were identified:

AlO3, Al12 BaO19, AlBaO4, AlBa306, and BaO. Each was found to melt congruently at 2072 C, 1900 C, 1811 C,

AlO3, Al12 BaO19, Al-BaO4, Al-Ba306, and BaO. Each was found to melt congruently at 2072 C, 1900 C, 1811 C, 1616 C, and 1918 C, respectively. Eutectics form at XBO=0.11, 0.32, 0.66, and 0.87 (relative to Al2O3) with melting points of 1875 C, 1620 C, 1480 C, and 1425 C. Sketch and fully label the phase diagram of this system.

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