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X-ray investigation of lateral hetero-structures of inversion domains in LiNbO3, KTiOPO4 and KTiOAsO4

DOI: 10.1107/S2053273315001503 DOI Help
PMID: 25921494 PMID Help

Authors: Thomas S. Lyford (The Sussex Innovation Centre) , Steve Collins (Diamond Light Source) , Paul F. Fewster (The Sussex Innovation Centre) , Pam Thomas (University of Warwick)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Acta Crystallographica Section A Foundations And Advances , VOL 71 , PAGES 255 - 267

State: Published (Approved)
Published: May 2015

Open Access Open Access

Abstract: 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 LiNbO3 (LN) ([Lambda] = 5 µm), KTiOPO4 (KTP) ([Lambda] = 9 µm) and KTiOAsO4 (KTA) ([Lambda] = 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 [Delta]d/d = 1.6 × 10-4 and 2.0 × 10-4 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 crystal truncation rods in LN and KTP was found to support the occurrence of surface corrugations.

Journal Keywords: Bragg Reflection; Correlaferroelectrics; diffraction; coherence; synchrotron radiation; grating

Subject Areas: Physics, Materials

Facility: SRS

Added On: 30/04/2015 13:49

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