The phase equilibria in the system zirconia‐hafnia‐yttria were investigated at 1300° and 1600°C by precise lattice parameter measurements and the direct phase‐inspection method. Large fluorite solid solution regions were dominant at both investigated temperatures. The extent of ordering within the ternary system was studied in the samples containing 40 mol% yttria at 1300°C. The δ‐phase (Zr,Hf) 3 Y 4 O 12 formation was established only in those samples with less than 15 mol% hafnia.
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Trubelja et al. (1988) studied this question.
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