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Atomic Scale Analysis of Cubic Zirconia Grain Boundaries

Published online by Cambridge University Press:  10 February 2011

E.C. Dickey ,
X. Fan ,
M. Yong ,
S.B. Sinnott  and
S.J. Pennycook
E.C. Dickey
Affiliation:
Department of Chemical and Materials Engineering, University of Kentucky, Lexington, KY 40506-0046; ecdickey@engr.uky.edu
X. Fan
Affiliation:
Department of Chemical and Materials Engineering, University of Kentucky, Lexington, KY 40506-0046; ecdickey@engr.uky.edu Department of Chemical and Materials Engineering, University of Kentucky, Lexington, KY 40506-0046
M. Yong
Affiliation:
Department of Chemical and Materials Engineering, University of Kentucky, Lexington, KY 40506-0046; ecdickey@engr.uky.edu
S.B. Sinnott
Affiliation:
Department of Chemical and Materials Engineering, University of Kentucky, Lexington, KY 40506-0046; ecdickey@engr.uky.edu
S.J. Pennycook
Affiliation:
Solid State Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831
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Abstract

The core structures of two symmetric tilt [001” grain boundaries in yttria- stabilized cubic zirconia are determined by Z-contrast imaging microscopy. In particular, near-σ=13 (510) and σ=5 (310) boundaries are studied. Both grain boundaries are found to be composed of periodic arrays of basic grain-boundary structural units, whose atomic structures are determined from the Z-contrast images. While both grain boundaries maintain mirror symmetry across the boundary plane, the 36° boundary is found to have a more compact structural unit than the 24° boundary. Partially filled cation columns in the 24° boundary are believed to prevent cation crowding in the boundary core. The derived grain boundary structural models are the first developed for ionic crystals having the fluorite structure

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 589 , 1999 , 323
Copyright
Copyright © Materials Research Society 2001

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