Abstract
The solubility limits of MgO in tetragonal zirconia were studied by combining the differential thermal analysis data and X-ray disappearing phase method. From these experiments a eutectoid reaction, tetragonal ZrO2 solid solution → monoclinic ZrO2 solid solution + MgO, at 1120±10 °C and 1.6±0.2 mol% MgO was established. The solubility of MgO in tetragonal ZrO2 diminished as the temperature increased, and at 1700 °C the solubility was less than 0.5 mol% MgO. The extent of the cubic zirconia solid solution single field was determined by using precise lattice parameter measurements and SEM observations. In this way an invariant eutectoid point, cubic ZrO2 solid solution → tetragonal ZrO2 solid solution + MgO, was located at 1420±10 °C and 14.8±0.5 mol% MgO.
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Duran, P., Rodriguez, J.M. & Recio, P. The ZrO2-rich region of the ZrO2-MgO system. J Mater Sci 26, 467–472 (1991). https://doi.org/10.1007/BF00576544
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DOI: https://doi.org/10.1007/BF00576544