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Atomic Structure OF YΣ=5 (130) Symmetrical Tilt Boundary In Strontium Titanate

Published online by Cambridge University Press:  15 February 2011

V. Ravikumar  and
Vinayak P. Dravid
V. Ravikumar
Affiliation:
Department of Materials Science and Engineering and, Materials Research Center, Northwestern University, Evanston, IL 60208.
Vinayak P. Dravid
Affiliation:
Department of Materials Science and Engineering and, Materials Research Center, Northwestern University, Evanston, IL 60208.
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Abstract

The atomic structure of a pristine (undoped) boundary in strontium titanate has been investigated using transmission electron microscopy techniques. Results of electron diffraction studies indicate a pure tilt boundary with a common \001] tilt axis, and a tilt angle of 36.8°, which corresponds to a Σ-= 5 grain boundary in the Coincidence Site Lattice (CSL) notation. High Resolution Transmission Electron Microscopy (HRTEM) indicates a symmetric tilt grain boundary with a (130) type grain boundary plane. No cation non-stoichiometry or impurity segregants could be detected at the interface, within the limits of the Energy Dispersive X-ray microanalysis technique used. The grain boundary has a compact core, with negligible planenormal rigid body translation (RBT). An in-plane RBT of (1/2)d130 (˜ 0.62 A°) was identified from the high resolution electron micrographs. An empirical model of the relaxed atomic structure of the grain boundary is proposed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 295: Symposium W – Atomic-Scale Imaging of Surfaces and Interfaces , 1992 , 115
Copyright
Copyright © Materials Research Society 1993

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