Journal
ACTA MATERIALIA
Volume 57, Issue 17, Pages 5264-5269Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2009.07.029
Keywords
Transmission electron microscopy; Perovskites; Dynamic phenomena; Grain boundary migration; Grain boundary structure
Funding
- Alexander von Humboldt Foundation (Bonn, Germany)
- Korean Government (MOEHRD [KRF-2008-314D00176]
- National Research Council of Science & Technology (NST), Republic of Korea [T29210] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The grain boundary kinetics of a SrTiO3 bicrystal with a misorientation relationship of 36.8 degrees/[1 0 0] (Sigma 5) is examined at elevated temperatures by in situ high-resolution transmission electron microscopy. At 973 K, the grain boundary migrates by the propagation of atomic steps with a height of half a unit cell (similar to 0.2 nm), but at 1173 K, it becomes rough and advances without the requirement of steps. All the temperatures examined are below the thermal roughening transition temperature of the grain boundary. These results give a clear indication of grain boundary kinetic roughening. We suggest that our present results may lead to the development of a unifying framework for previously suggested grain boundary migration mechanisms. (C) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved,
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