The isothermal sections at 1250 and 1600°C for the Al2O3–HfO2–Er2O3 phase diagram are constructed for the first time. Phase equilibria are established at these temperatures; they are determined by the most thermodynamically stable compound, HfO2. No ternary compounds or appreciable solid-solution regions based on components or binary compounds are found in the ternary system. The presence of AL + F, Er3A5 + F, ErA + F, and Er2A + F two-phase regions on the isothermal section at 1650°C suggests that they contain triangulating sections of the Al2O3–HfO2–Er2O3 ternary system.
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Notes
Composition is in mol.% here and further in the text.
The Er2O3 content (%) of the M and F solid solutions based on HfO2 and of the C solutions based on Er2O3 is indicated in parentheses here and further in the text.
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Translated from Poroshkovaya Metallurgiya, Vol. 51, No. 9–10 (487), pp. 114–122, 2012.
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Tishchenko, Y.S., Lakiza, S.M., Red’ko, V.P. et al. Isothermal sections of the Al2O3–HfO2–Er2O3 phase diagram at 1250 and 1600°C. Powder Metall Met Ceram 51, 594–601 (2013). https://doi.org/10.1007/s11106-013-9473-2
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DOI: https://doi.org/10.1007/s11106-013-9473-2