Abstract
A surface structural analysis of two ceramic samples of zirconium oxide (ZrO2) sintered at 1550°C, stabilized in the tetragonal form, before and after hydrothermal treatment, has been performed by the Rietveld method based on X-ray diffraction (XRD) data. The first sample was zirconium oxide with addition of ytterbium oxide (3 mol %), and the second sample contained ytterbium (3 mol %) and neodymium (0.25 mol %) oxides. The hydrothermal treatment is found to change the phase composition. In the initial state, there are two tetragonal ZrO2 forms (t and t'). The processes of surface-layer dissolution and crystallization of the monoclinic ZrO2 modification occur during hydrothermal treatment. ZrO2 crystals are shaped as plates elongated in the [111] direction, with developed {001} faces. Addition of neodymium oxide slows down the monoclinic-phase formation.
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Sirotinkin, V.P., Podzorova, L.I., Mikhailina, N.A. et al. X-ray Diffraction Study of Structural Changes in High-Strength Ceramics Based on Zirconium Oxide with Additions of Ytterbium and Neodymium Oxides after Hydrothermal Treatment. Crystallogr. Rep. 67, 278–285 (2022). https://doi.org/10.1134/S1063774522020171
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DOI: https://doi.org/10.1134/S1063774522020171