Gorfman, Semën, Keeble, Dean S., Bombardi, Alessandro and Thomas, Pam A. (2015) Topology and temperature dependence of the diffuse X-ray scattering in Na0.5Bi0.5TiO3 ferroelectric single crystals. Journal of Applied Crystallography, 48 (5). pp. 1543-1550. doi:10.1107/S160057671501571X

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Abstract

The results of high-resolution measurements of the diffuse X-ray scattering produced by a perovskite-based Na0.5Bi0.5TiO3 ferroelectric single crystal between 40 and 620 K are reported. The study was designed as an attempt to resolve numerous controversies regarding the average structure of Na0.5Bi0.5TiO3, such as the mechanism of the phase transitions between the tetragonal, P4bm, and rhombohedral | monoclinic, R3c | Cc, space groups and the correlation between structural changes and macroscopic physical properties. The starting point was to search for any transformations of structural disorder in the temperature range of thermal depoling (420–480 K), where the average structure is known to remain unchanged. The intensity distribution around the {032} pseudocubic reflection was collected using a PILATUS 100K detector at the I16 beamline of the Diamond Light Source (UK). The data revealed previously unknown features of the diffuse scattering, including a system of dual asymmetric L-shaped diffuse scattering streaks. The topology, temperature dependence, and relationship between Bragg and diffuse intensities suggest the presence of complex microstructure in the low-temperature R3c | Cc phase. This microstructure may be formed by the persistence of the higher-temperature P4bm phase, built into a lower-temperature R3c | Cc matrix, accompanied by the related long-range strain fields. Finally, it is shown that a correlation between the temperature dependence of the X-ray scattering features and the temperature regime of thermal depoling is present.

Item Type:	Journal Article
Subjects:	Q Science > QC Physics
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	X-rays -- Scattering, Perovskite
Journal or Publication Title:	Journal of Applied Crystallography
Publisher:	Wiley-Blackwell Publishing Ltd.
ISSN:	0021-8898
Official Date:	October 2015
Dates:	Date Event October 2015 Published 20 September 2015 Available 21 August 2015 Accepted 29 April 2015 Submitted
Date of first compliant deposit:	23 June 2016
Volume:	48
Number:	5
Page Range:	pp. 1543-1550
DOI:	10.1107/S160057671501571X
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Open Access

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