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The phase equilibria in the zirconia-rich part of the system Zr02-Yb203-Yz03 were determined at 1200", 1400", and 1650°C. The stabilizing effects of Ybz03 and Yz03 were found to be quite similar with <10 mol% of either being necessary to fully stabilize the cubic fluorite-structure phase at 1200°C. The two binary ordered phases, Zr3Yb4012 and Zr3Y4012, are completely miscible at 1200°C. These were the only binary or ternary phases detected. The ionic conductivities of ternary specimens in this system were measured using the complex impedance analysis technique. For a given level of total dopant, the substitution of Ybz03 for YZO3 gives only minor increases in specimen conductivity.

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