Nonlinear driving force-velocity relationship for the migration of faceted boundaries

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A non-linear relationship between boundary migration and its driving force for faceted grain boundaries is demonstrated in a BaTiO3 model system using the solid-state single-crystal growth technique. BaTiO3 (0.4 mol.% TiO2) samples with different grain sizes were prepared by sintering powder compacts in H-2 for various times. Single-crystal seeds with {1 0 0} and {2 1 0} orientations were joined to the sintered samples and annealed in air for various times up to 20 h. During the air annealing, the matrix grain size did not change, indicating that the driving force for the growth of the single-crystal seeds remained constant. Under driving forces that exceeded a critical value, the seed crystals grew into the polycrystals. The critical driving force was lower and the growth rate was similar to 10 times higher for the {1 0 0} crystal compared with the {2 1 0} crystal. These results demonstrate the presence of a critical driving force for the migration of a faceted boundary and the remarkable effect of the crystallographic orientation on the boundary migration. The observed nonlinear migration behavior of faceted boundaries is similar to that of faceted solid/liquid interfaces. (C) 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Issue Date
2012-06
Language
English
Article Type
Article
Keywords

ABNORMAL GRAIN-GROWTH; TITANATE SINGLE-CRYSTALS; BARIUM-TITANATE; INTERFACE STRUCTURE; UNDOPED STRONTIUM; MOBILITY; BATIO3; MOTION; SIMULATION; CERAMICS

Citation

ACTA MATERIALIA, v.60, no.11, pp.4531 - 4539

ISSN
1359-6454
DOI
10.1016/j.actamat.2012.05.006
URI
http://hdl.handle.net/10203/102217
Appears in Collection
EEW-Journal Papers(저널논문)MS-Journal Papers(저널논문)
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