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Vacancy ordering in reduced barium titanate
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Woodward, David I., Reaney, Ian M., Yang, G. Y., Dickey, E. C. and Randall, C. A. (2004) Vacancy ordering in reduced barium titanate. Applied Physics Letters, Vol.84 (No.23). pp. 4650-4652. doi:10.1063/1.1759390 ISSN 00036951.
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Official URL: http://dx.doi.org/10.1063/1.1759390
Abstract
A crystal structure is proposed for reduced barium titanate, BaTiO3−δ, δ≈0.33, formed during the degradation of Ni–BaTiO3 X7R multilayer ceramic capacitors. High-resolution transmission electron microscopy and selected-area electron diffraction have been used in combination with computer simulations to show that oxygen vacancies accrete on every third pseudocubic {111} plane, resulting in a cell with space group P3m1. Additionally, from electron energy loss spectroscopy, it is proposed that Ti4+ is reduced to Ti3+ as a mechanism of charge compensation within oxygen-deficient octahedra.
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QC Physics Q Science > QD Chemistry |
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
Library of Congress Subject Headings (LCSH): | Barium compounds, Electron microscopy | ||||
Journal or Publication Title: | Applied Physics Letters | ||||
Publisher: | American Institute of Physics | ||||
ISSN: | 00036951 | ||||
Official Date: | 7 June 2004 | ||||
Dates: |
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Volume: | Vol.84 | ||||
Number: | No.23 | ||||
Page Range: | pp. 4650-4652 | ||||
DOI: | 10.1063/1.1759390 | ||||
Status: | Peer Reviewed | ||||
Funder: | National Science Foundation (U.S.) (NSF) | ||||
Grant number: | 0120812 (NSF) |
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