Abstract
Nanocomposite ceramic materials were fabricated by conventional sintering of composite powders obtained by sol-gel coating of submicron powders. The microstructure of these MgAl2O4–ZrO2 materials was studied by transmission electron microscopy. All zirconia grains were in the tetragonal phase. In addition, the intragranular zirconia crystals exhibited heteroepitaxial orientation relationships with the surrounding spinel grains, (hkl)zirconia//(hkl)spinel. Semi-coherent interfaces along {111} planes were observed by high-resolution microscopy. The transformation toward the orthorhombic or the monoclinic phase retained the epitaxial relationships as far as possible. The presence of such heteroepitaxial intragranular crystals in sintered ceramic materials, which did not involve a melting stage, was attributed to the specificity of the material preparation process.
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Guinebretière, R., Oudjedi, Z., Soulestin, B. et al. Semi-coherent zirconia inclusions in a ceramic matrix. Journal of Materials Research 15, 2482–2487 (2000). https://doi.org/10.1557/JMR.2000.0356
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DOI: https://doi.org/10.1557/JMR.2000.0356