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

Nanotechnology
A B NadenD A MacLaren

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.

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Citations

Sep 5, 2020·Microscopy and Microanalysis : the Official Journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada·Gary W PatersonMagnus Nord
Nov 22, 2018·Applied Optics·Mohammad Yeganeh, Saifollah Rasouli
Oct 27, 2020·Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences·Martha IlettRik Brydson
Jan 4, 2020·Chemical Reviews·Yu FengWeidong Fei

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