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. ISSN 1431-9276

Preview	PDF WRAP_Woodward_0971580-px-060411-07_yang_2004_bt_micros-microanal.pdf - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader Download (380Kb)
	PDF WRAP_Woodward_Permission_Barwick_7_April_2011.pdf Restricted to Repository staff only - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader Download (53Kb)

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
Subjects:	Q Science > QC Physics
Divisions:	Faculty of 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
Date:	2004
Volume:	Vol.10
Page Range:	pp. 992-993
Identification Number:	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
References:	1. D. C. Sinclair, J. M. S. Skakle, F. D. Morrison, R. I. Smith, and T. P. Beales, J. Mater. Chem. 9, 1327 (1991). 2. D. S. Filimonov, Z-K. Liu, and C. A. Randall, Mat. Res. Bull. 34, 545 (2003). 3. G. Y. Yang, E.C. Dickey, C.A. Randall, M. S. Randall, and L. A. Mann, J. Appl. Phys. 94, 5990 (2003).
URI:	http://wrap.warwick.ac.uk/id/eprint/4504

Request changes to a record

Actions (login required)

View Item