Evaluation of crystallographic strain, rotation and defects in functional oxides by the moiré effect in scanning transmission electron microscopy

Naden, A.B., O'Shea, K.J. and MacLaren, D.A. (2018) Evaluation of crystallographic strain, rotation and defects in functional oxides by the moiré effect in scanning transmission electron microscopy. Nanotechnology, 29(16), 165704. (doi:10.1088/1361-6528/aaae50)

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Abstract

Moiré patterns in scanning transmission electron microscopy (STEM) images of epitaxial perovskite oxides are used to assess strain and defect densities over fields of view extending over several hundred nanometers. The patterns arise from the geometric overlap of the rastered STEM electron beam and the samples' crystal periodicities and we explore the emergence and application of these moiré fringes for rapid strain analysis. Using the epitaxial functional oxide perovskites BiFeO3 and Pr1−x Ca x MnO3, we discuss the impact of large degrees of strain on the quantification of STEM moiré patterns, identify defects in the fringe patterns and quantify strain and lattice rotation. Such a wide-area analysis of crystallographic strain and defects is crucial for developing structure-function relations of functional oxides and we find the STEM moiré technique to be an attractive means of structural assessment that can be readily applied to low dose studies of damage sensitive crystalline materials.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:O'Shea, Miss Kerry and MacLaren, Dr Donald
Authors: Naden, A.B., O'Shea, K.J., and MacLaren, D.A.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Nanotechnology
Publisher:IOP Publishing
ISSN:0957-4484
ISSN (Online):1361-6528
Published Online:27 February 2018
Copyright Holders:Copyright © 2018 IOP Publishing Ltd
First Published:First published in Nanotechnology 29(16):165704
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
584861EPSRC Doctoral Training Grant 2011-2015Mary Beth KneafseyEngineering and Physical Sciences Research Council (EPSRC)EP/J500434/1VPO VICE PRINCIPAL RESEARCH & ENTERPRISE
530721Integrating advanced nanomaterials into transformative technologiesDonald MaclarenEngineering and Physical Sciences Research Council (EPSRC)EP/I00419X/1P&A - PHYSICS & ASTRONOMY