For more complete description of the Al2O3–HfO2–La2O3 phase diagram, three vertical sections are constructed in a wide temperature and composition range. Isopleth 20 mol.% HfO2 (20H) shows the Al2O3–HfO2–La2O3 constitution in the Al2O3-rich region. Isopleth 60 mol.% HfO2 (60H) describes the ternary system in the Al2O3- and La2O3-rich regions and F ⇄ T phase transformation of HfO2 solid solutions. The radial La2O3–(50 mol.% Al2O3 · 50 mol.% HfO2) vertical section reveals the nature of X ⇄ H ⇄ A phase transformations of La2O3 solid solutions. The vertical sections intersect all three triangulating planes of the Al2O3–HfO2–La2O3 system and demonstrate variation in the width of their two-phase regions.
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L. M. Lopato is deceased.
Translated from Poroshkovaya Metallurgiya, Vol. 55, Nos. 1–2 (507), pp. 96–103, 2015.
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Lakiza, S.M., Tishchenko, Y.S. & Lopato, L.M. Vertical Sections of the Al2O3–HfO2–La2O3 Phase Diagram. Powder Metall Met Ceram 55, 72–77 (2016). https://doi.org/10.1007/s11106-016-9782-3
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DOI: https://doi.org/10.1007/s11106-016-9782-3