Journal
ACTA MATERIALIA
Volume 59, Issue 5, Pages 1964-1973Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2010.11.062
Keywords
Grain boundary structure; Grain boundary faceting; Grain growth; Donor doping; Barium titanate
Funding
- Korea government (MEST) [2010-0000739]
- Samsung Electro-Mechanics Co. Ltd. through the Center for Advanced MLCC-Manufacturing Processes
- National Research Foundation of Korea [2008-0060547] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The structural transition of grain boundaries in BaTiO3 and related grain growth behavior have been investigated with changing Nd2O3 dopant concentration and oxygen partial pressure. A correlation among total vacancy concentration, grain boundary structure and grain growth behavior was found. When the total vacancy concentration was low by any means, grain boundaries were well faceted and abnormal grain growth occurred in the presence of {1 1 1} double twins. However, as the total vacancy concentration increased, the fraction of faceted grain boundary gradually decreased and the formation of {1 1 1} twins was suppressed. Further increase in the total vacancy concentration resulted in a change in grain boundary structure from faceted to rough and suppression of abnormal grain growth. These observed changes in grain growth behavior, including a grain growth anomaly with donor doping, can therefore be attributed to a change in boundary mobility with grain boundary structure, which was governed by the total vacancy concentration. (c) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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