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Author Browning, N. D. ♦ Buban, J. P. ♦ Moltaji, H. O. ♦ Pennycook, S. J. ♦ Duscher, G. ♦ Johnson, K. D. ♦ Rodrigues, R. P. ♦ Dravid, V. P.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword MATERIALS SCIENCE ♦ STRONTIUM COMPOUNDS ♦ MANGANESE ♦ STRONTIUM TITANATES ♦ GRAIN BOUNDARIES ♦ CRYSTAL STRUCTURE ♦ VACANCIES ♦ ANNEALING ♦ MANGANESE ADDITIONS ♦ DOPED MATERIALS ♦ ENERGY-LOSS SPECTROSCOPY ♦ ELECTRIC CHARGES
Abstract An experimental atomic resolution analysis of an undoped {Sigma}5 36{degree} [001] tilt grain boundary in SrTiO{sub 3} shows that the structure contains incomplete oxygen octahedra. These incomplete octahedra act as {ital effective} oxygen vacancies and lead to a fixed, positive boundary charge. Annealing the boundary in the presence of MnO{sub 2} does not change the atomic structure of the boundary plane, and results in a high concentration of Mn{sup 3+} (acceptor) enrichment at the specific Ti{sup 4+} locations in closest proximity to the effective oxygen vacancies. This result can be explained in terms of standard charge compensation models and indicates that the formation of electrical barriers at oxide grain boundaries may be influenced by the atomic structure of the boundary plane. {copyright} {ital 1999 American Institute of Physics.}
ISSN 00036951
Educational Use Research
Learning Resource Type Article
Publisher Date 1999-05-01
Publisher Place United States
Journal Applied Physics Letters
Volume Number 74
Issue Number 18


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