Abstract
Microstructure of calzirtite (Ca 2Zr 5Ti 2O 16) in CaOZrO 2TiO 2 ceramics was studied by transmission electron microscopy. The ceramics were prepared by liquid phase sintering (1600 °C, 6 h) powders of calcia-partially stabilized zirconia (PSZ of composition ZrO 2-10.8 mol.% CaO and phase assemblages of tetragonal (t) ZrO 2 in the cubic (c) ZrO 2 matrix) and adding to them 2 mol.%, 4 mol.% and 8 mol.% TiO 2 (designated specimens 2T, 4T and 8T respectively). Calzirtite was not formed in specimen 2T, but formed in the grain-boundary liquid of specimens 4T and 8T by epitaxial nucleation from ZrO 2 followed by cellular or spherulitic growth to form plate-like variants with &{;200&}; habit plane which elongated predominantly along the crystallographic c axis. For specimen 8T, calzirtite was formed in the shell region of the PSZ grains and appeared more or less equiaxed by domain nucleation within the c-ZrO 2 matrix. In addition to the effect of interfacial energy, structural similarity was crucial for nucleating calzirtite epitaxially from ZrO 2.
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