Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 28, Issue 9, Pages 1821-1825Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2007.11.015
Keywords
electron microscopy; grain growth; BaTiO3; abnormal grain growth
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The microstructure of abnormal grains in BaTiO3 based ceramics suggests that 2D nucleation and lateral growth take place in the material. High-resolution transmission electron microscopy investigation reveals that nucleation takes place at triple junctions of abnormal grain and adjacent matrix grains, subsequently form steps and the steps grow laterally along {111} planes of the abnormal grains. The abnormal grain boundaries are faceted in the growth direction, however, the ledges, which possess boundaries deviated from low-index crystallographic planes of the abnormal grains, could provide high mobility necessary for abnormal grain growth. (C) 2008 Elsevier Ltd. All rights reserved.
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