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Atomic Structure of Σ = 5 (130) Symmetrical Tilt Boundary in Strontium Titanate

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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 plane-normal 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.

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Acknowledgements

This research is supported through a seed grant by the MRL program of the National Science Foundation, at the Materials Research Center of Northwestern University, under award no. DMR-9120521, and the U. S. Department of Energy - Basic Energy Sciences, Grant No. DE-FG02-92ER45475.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, and Materials Research Center, Northwestern University, Evanston, IL, 60208, USA

    V. Ravikumar & Vinayak P. Dravid

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  1. V. Ravikumar
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  2. Vinayak P. Dravid
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Ravikumar, V., Dravid, V.P. Atomic Structure of Σ = 5 (130) Symmetrical Tilt Boundary in Strontium Titanate. MRS Online Proceedings Library 295, 115–120 (1992). https://doi.org/10.1557/PROC-295-115

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  • DOI: https://doi.org/10.1557/PROC-295-115

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