Phase Equilibria and Ordering in the System ZrO2-Y2O3 |
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Authors: | V S STUBICAN R C HINK S P RAY |
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Affiliation: | Department of Material Sciences, The Pennsylvania State University, University Park, Pennsylvania 16802 |
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Abstract: | The phase diagram for the system ZrO2-Y2O3 was redetermined. The extent of the fluorite-type ZrO2-YzO3 solid solution field was determined with a high-temperature X-ray furnace, precise lattice parameter measurements, and a hydrothermal technique. Long range ordering occurred at 40 mol% Y2O3 and the corresponding ordered phase was Zr3Y4OL12. The compound has rhombohedra1 symmetry (space group R 3), is isostructural with UY6Ol2 and decomposes above 1250±50°C. The results indicate that the eutectoid may occur at a temperature <400°C at a composition between 20 and 30 mol% Y2O3 Determination of the liquidus line indicated a eutectic at 83± 1 mol% Y2O3 and a peritectic at 76 ± 1 mol% Y2O3. |
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