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HRTEM study of a new non-stoichiometric BaTiO(3-δ) structure
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Yang, G. Y., Dickey, E. C., Randall, C. A., Woodward, David I. and Reaney, I. M. (2004) HRTEM study of a new non-stoichiometric BaTiO(3-δ) structure. Microscopy and Microanalysis, Vol.10 . pp. 992-993. doi:10.1017/S1431927604884927 ISSN 1431-9276.
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Official URL: http://dx.doi.org/10.1017/S1431927604884927
Abstract
BaTiO3-based multilayer ceramic capacitors (MLCCs) with Ni internal electrodes are co-fired in
reducing atmospheres to avoid oxidation of the electrode. Although dielectric materials are doped by
acceptor, donor and amphoteric dopants to minimize the oxygen vacancy content, there is still a
large concentration of oxygen vacancies that are accommodated in the BaTiO3 active layers. In
general, ABO3 perovskites demonstrates a strong ability to accommodate the oxygen vacancies and
maintain a regular pseudo-cubic structure. Oxygen deficient barium titanate can be transformed to a
hexagonal polymorph (h-BT) at high temperatures1,2. In this paper, we report the new modulated and
long range ordered structures of non-stoichiometric BaTiO3-δ that are observed in the electrically
degraded Ni-BaTiO3 MLCCs at low temperature.
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QC Physics | ||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
Library of Congress Subject Headings (LCSH): | Barium metatitanate, Ceramic capacitors, Dielectrics | ||||
Journal or Publication Title: | Microscopy and Microanalysis | ||||
Publisher: | Cambridge University Press | ||||
ISSN: | 1431-9276 | ||||
Official Date: | 2004 | ||||
Dates: |
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Volume: | Vol.10 | ||||
Page Range: | pp. 992-993 | ||||
DOI: | 10.1017/S1431927604884927 | ||||
Status: | Peer Reviewed | ||||
Access rights to Published version: | Restricted or Subscription Access | ||||
Funder: | National Science Foundation (U.S.) (NSF), KEMET Electronic Corporation, Pennsylvania State University |
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