Homogeneous metastable tetragonal ( t ′) solid solutions of ZrO 2 — x mol% CeO 2 ( x = 20 and 50) were successfully synthesized by the organic polymerized complex method. The citric acid‐ethylene glycol solution containing Zr and Ce ions was polymerized at about 140°C and then heat‐treated at about 350°C to obtain a precursor. The black precursor was heated at 450°C and then fired up to 1300° or 1590°C, resulting in the homogeneous solid solutions.
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Yashima et al. (1994) studied this question.
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