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Title: X-ray investigation of lateral hetero-structures of inversion domains in LiNbO{sub 3}, KTiOPO{sub 4} and KTiOAsO{sub 4}

Periodically-poled ferroelectric crystals are studied by observing their superlattice (grating) diffraction profiles with high-resolution X-ray diffraction. In order to successfully model the data, the effects of strain, and sample and beam coherence, must be taken into account. In this paper periodically domain-inverted (PDI) ferroelectric crystals are studied using high-resolution X-ray diffraction. Rocking curves and reciprocal-space maps of the principal symmetric Bragg reflections in LiNbO{sub 3} (LN) (Λ = 5 µm), KTiOPO{sub 4} (KTP) (Λ = 9 µm) and KTiOAsO{sub 4} (KTA) (Λ = 39 µm) are presented. For all the samples strong satellite reflections were observed as a consequence of the PDI structure. Analysis of the satellites showed that they were caused by a combination of coherent and incoherent scattering between the adjacent domains. Whilst the satellites contained phase information regarding the structure of the domain wall, this information could not be rigorously extracted without a priori knowledge of the twinning mechanism. Analysis of the profiles reveals strain distributions of Δd/d = 1.6 × 10{sup −4} and 2.0 × 10{sup −4} perpendicular to domain walls in KTP and LN samples, respectively, and lateral correlation lengths of 63 µm (KTP), 194 µm (KTA) and 10 µm (LN). The decay of crystalmore » truncation rods in LN and KTP was found to support the occurrence of surface corrugations.« less
Authors:
 [1] ;  [2] ;  [1] ;  [3] ;  [4]
  1. Panalytical Research, The Sussex Innovation Centre, Falmer, Brighton, BN1 9SB (United Kingdom)
  2. Diamond Light Source Ltd, Diamond House, Harwell Science and Innovation Campus, Didcot, Oxfordshire, OX11 0DE (United Kingdom)
  3. Department of Physics, University of Warwick, CV4 7AL (United Kingdom)
  4. (United Kingdom)
Publication Date:
OSTI Identifier:
22351161
Resource Type:
Journal Article
Resource Relation:
Journal Name: Acta crystallographica. Section A, Foundations and advances (Online); Journal Volume: 71; Journal Issue: Pt 3; Other Information: PMCID: PMC4413913; PMID: 25921494; PUBLISHER-ID: wo5016; OAI: oai:pubmedcentral.nih.gov:4413913; Copyright (c) Thomas S. Lyford et al. 2015; This is an open-access article distributed under the terms of the Creative Commons Attribution Licence, which permits unrestricted use, distribution, and reproduction in any medium, provided the original authors and source are cited.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United Kingdom
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; BRAGG REFLECTION; CORRELATIONS; CRYSTALS; DIFFRACTION; DISTRIBUTION; FERROELECTRIC MATERIALS; GRATINGS; NEUTRON DIFFRACTION; RODS; STRAINS; SUPERLATTICES; SURFACES; SYNCHROTRON RADIATION; X-RAY DIFFRACTION