An efficient approach to characterize pseudo-merohedral twins by precession electron diffraction: Application to the LaGaO3 perovskite |
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Authors: | G Ji J-P Morniroli GJ Auchterlonie J Drennan D Jacob |
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Affiliation: | 1. Laboratoire de Métallurgie Physique et Génie des Matériaux, UMR CNRS 8517, USTL and ENSCL, Cité Scientifique, 59650 Villeneuve d’Ascq, France;2. Centre for Microscopy and Microanalysis, The University of Queensland, Brisbane 4072 QLD, Australia;3. School of Engineering, The University of Queensland, Brisbane 4072 QLD, Australia;4. Laboratoire de Structure et Propriétés de l’Etat Solide-UMR CNRS 8008, Université des Sciences et Technologies de Lille – Bât. C6, 59655 Villeneuve d’Ascq Cedex, France |
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Abstract: | Pseudo-merohedral twins are frequently observed in crystals displaying pseudo-symmetry. In these crystals, many u v w] zone axis electron diffraction patterns are very close and can only be distinguished from intensity considerations. On conventional diffraction patterns (selected-area electron diffraction or microdiffraction), a strong dynamical behaviour averages the diffracted intensities so that only the positions of the reflections on a pattern can be considered. On precession electron diffraction patterns, the diffracted beams display an integrated intensity and a “few-beam” or “systematic row” behaviour prevails which strongly reduces the dynamical interactions. Therefore the diffracted intensity can be taken into account. A procedure based on observation of the weak extra-reflections connected with the pseudo-symmetry is given to identify without ambiguity any zone axis. It is successfully applied to the identification and characterization of {1 2 1} reflection twins present in the LaGaO3 perovskite. |
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Keywords: | Electron diffraction Precession electron diffraction Twin LaGaO3 perovskite |
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