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Direct Determination of Grain Boundary Atomic Structure in SrTiO3

  • M.M. McGibbon (a1), N.D. Browning (a1), A.J. McGibbon (a1), M.F. Chisholm (a1) and S.J. Pennycook (a1)...


In the electroceramic SrTiO3 the grain boundary atomic structure governs a variety of electrical properties such as non-linear I-V characteristics. An understanding of this atomic structure-property relationship for individual grain boundaries requires a technique which probes both composition and chemical bonding on an atomic scale. Atomic structure models for [001] tilt boundaries in SrTiO3 bicrystals have been determined directly from experimental data, by combining high-resolution Z-contrast imaging to locate the cation columns at the boundary, with simultaneous electron energy loss spectroscopy to examine light element coordination at atomic resolution. In this paper we compare and contrast the grain boundary structure models of symmetric and asymmetric boundaries in SrTiO3.



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14. We would like to thank Estes, T. C. and Luck, J. T. for technical assistance. This research was sponsored by the Division of Materials Sciences, US Department of Energy, under contract No. DE-AC05-84OR21400 with Martin Marietta Energy Systems, Inc., and supported in part by an appointment to the Oak Ridge National Laboratory Postdoctoral Research Program administered by the Oak Ridge Institute for Science and Education.


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