Abstract
The isothermal sections at 1250 and 1600°C for the Al2O3–HfO2–La2O3 phase diagram are constructed for the first time. No ternary compounds or appreciable regions of solid solutions based on components or binary compounds are found in the ternary system. The triangulation of the system is determined by the La2Hf2O7 phase being most thermodynamically stable.
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