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Shape Evolution of SrTiO 3 Crystals During Coarsening in a Titania‐Rich Liquid
Author(s) -
Sano Tomoko,
Kim ChangSoo,
Rohrer Gregory S.
Publication year - 2005
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2005.00185.x
Subject(s) - surface energy , materials science , morphology (biology) , surface (topology) , range (aeronautics) , contact angle , contact area , capillary action , chemical physics , crystallography , nanotechnology , composite material , geometry , chemistry , geology , paleontology , mathematics
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 SrTiO 3 crystals in contact with a titania‐rich liquid at 1500°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 {100} and {110} surfaces are approximately equal at the initial stage, but after 24 h of growth, the {100} surface area is more than twice as great as the {110} surface area. At this point, {100} 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.