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- Title
Shape Evolution of SrTiO<sub>3</sub> Crystals During Coarsening in a Titania-Rich Liquid.
- Authors
Sano, Tomoko; Chang-Soo Kim; Rohrer, Gregory S.
- Abstract
To identify factors that might affect capillary driving forces and interface structure-dependent mechanisms for coarsening, we have used a stereological analysis to determine the changes in the morphology of SrTiO3 crystals in contact with a titania-rich liquid at 150°C. A combination of flat and curved surfaces is observed in contact with the liquid. The (100) surface is the most common, followed by (110). A range of surfaces in the 〈100〉 zone are also found, but with a lower frequency. The areas of the &lcub;100&rcub; and &lcub;110&rcub; surfaces are approximately equal at the initial stage, but after 24 h of growth, the &lcub;100&rcub; surface area is more than twice as great as the &lcub;110&rcub; surface area. At this point, &lcub;100&rcub; surfaces make up more than 25% of the surface area in contact with the liquid. The results suggest that morphological changes during growth continuously reduce the average surface energy and interface mobility. This provides a plausible explanation for coarsening rates that decrease faster than predicted by the classical theory.
- Subjects
CRYSTALS; GEOMETRIC shapes; OSTWALD ripening; TITANIUM dioxide; INTERFACES (Physical sciences); SURFACE chemistry
- Publication
Journal of the American Ceramic Society, 2005, Vol 88, Issue 4, p993
- ISSN
0002-7820
- Publication type
Article
- DOI
10.1111/j.1551-2916.2005.00185.x