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Direct Determination of Grain Boundary Atomic Structure in SrTiO3

Published online by Cambridge University Press:  15 February 2011

M.M. McGibbon
Affiliation:
Solid State Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6031, USA
N.D. Browning
Affiliation:
Solid State Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6031, USA
A.J. McGibbon
Affiliation:
Solid State Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6031, USA
M.F. Chisholm
Affiliation:
Solid State Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6031, USA
S.J. Pennycook
Affiliation:
Solid State Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6031, USA
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Abstract

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.

Type
Research Article
Copyright
Copyright © Materials Research Society 1995

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References

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