Abstract
Critical review of the phase diagrams proposed previously suggested incomplete establishment of the phse equilibria in the system ZrO 2CeO 2 below 1400°C. Application of hydrothermal techniques enabled us to attain the equilibria in this system. The tetragonal SS (solid solution) was no longer stable below 1000°C, where it decomposed into the stable monoclinic SS and cubic SS. The solubility limit of the tetragonal or cubic SS was 23 wt%(18 mol%) CeO 2 or 79 wt%(73 mol%) CeO 2, respectively at 1400°C. That of the monoclinic or cubic SS was 5 wt%(3.5 mol%) CeO 2 or 96 wt%(95 mol%) CeO 2, respectively at 800°C. Thermochemical calculation appears to make it possible to predict true equilibria in this system.
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