Raman spectroscopy is found to be a powerful tool to determine the structural phase boundary between cubic (Fm3m) and tetragonal (P42/nmc) phase in arc-melted Zr1−XYXO2−X/2 (0.08≤X≤0.24) solid solution. The Raman peak intensity characteristic of the tetragonal phase at about 470 cm−1 decreases with the YO1.5 content X and becomes 0 around X=0.18.
Homogeneous metastable tetragonal (t') solid solutions ofZr0,-x mol% CeO, (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 150°C and then fired up to 1300" or 1590"C, resulting in the homogeneous solid solutions.
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