Abstract
Phase relations below 1700°C in the ZrO2-rich region of the zirconia-ytterbia system have been established using thermal expansion, room-temperature X-ray diffraction, precision lattice parameter measurements and microscopic observations. The solubility limits of ytterbia in both monoclinic and tetragonal zirconia were determined. A eutectoid reaction, tetragonal zirconia solid solution→ monoclinic + cubic zirconia solid solutions at 400 ± 20°C and 2.4 mol % ytterbia was found. The left-hand boundary of the cubic zirconia solid-solution field was redetermined between room temperature and about 1700°C. Long-range ordering was present at 40 mol % ytterbia and the formation of an ordered phase, Zr3Yb4O12, isostructural with M7O12-type compounds was found. Its thermal stability was established between room temperature and 1630 ± 10°C, in which it decomposes into cubic zirconia solid solution by an order-disorder reaction.
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González, M., Moure, C., Jurado, J.R. et al. Solid-state reaction, microstructure and phase relations in the ZrO2-rich region of the ZrO2-Yb2O3 system. J Mater Sci 28, 3451–3456 (1993). https://doi.org/10.1007/BF01159821
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DOI: https://doi.org/10.1007/BF01159821