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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. 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 |
|---|---|
| Subjects: | Q Science > QC Physics Q Science > QD Chemistry |
| Divisions: | Faculty of 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 |
| Date: | 7 June 2004 |
| Volume: | Vol.84 |
| Number: | No.23 |
| Page Range: | pp. 4650-4652 |
| Identification Number: | 10.1063/1.1759390 |
| Status: | Peer Reviewed |
| Funder: | National Science Foundation (U.S.) (NSF) |
| Grant number: | 0120812 (NSF) |
| URI: | http://wrap.warwick.ac.uk/id/eprint/36461 |
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