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Phase relationships in the yttria-rich part of the yttria-zirconia system

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Abstract

Phase equilibria in yttria-zirconia mixtures containing not less than 50 mol % YO1.5 have been studied between 1200 and 2200° C. The solubility of zirconia in yttria is shown to decrease with increasing temperature: the miscibility gap between the zirconia (fluorite) and yttria (type C rare earth) solid solutions extends from 64 to 75 mol % YO1.5 at 1400° C, from 66 to 79% at 1700° C and from 73 to 85% at 2000° C. An ordered fluorite-related phase with the ideal formula Zr3Y4O12 and a narrow homogeneity range, which disorders at about 1370° C, is reported.

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  1. CSIRO Division of Tribophysics, Fishermen's Bend, Melbourne, Victoria, Australia

    H. G. Scott

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  1. H. G. Scott
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Scott, H.G. Phase relationships in the yttria-rich part of the yttria-zirconia system. J Mater Sci 12, 311–316 (1977). https://doi.org/10.1007/BF00566272

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