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Inference of oxygen vacancies in hydrothermal Na0.5Bi0.5TiO3

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O'Brien, Aoife, Woodward, David I., Sardar, Kripasindhu, Walton, Richard I. and Thomas, Pam A. (2012) Inference of oxygen vacancies in hydrothermal Na0.5Bi0.5TiO3. Applied Physics Letters, Vol.101 (No.14). p. 142902. ISSN 1077-3118

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Abstract

A high-resolution x-ray powder diffraction study has been made of pseudo-rhombohedral and tetragonal phases in Na0.5Bi0.5TiO3 (NBT), produced via hydrothermal and conventional solidstate methods. Hydrothermal NBT exhibits significantly greater structural distortion at room
temperature than solid-state NBT. Peak widths and superstructure peak intensities show a phase
transition at 305 C, with trends suggesting that the structure tends towards cubic symmetry at this temperature. Structural refinements indicate that the transition occurs via a phase coexistence region with no clear intermediate phase. Piezoelectric data show evidence of polarisation pinning in hydrothermal NBT, interpreted as a high proportion of oxygen vacancies.

Item Type: Submitted Journal Article
Subjects: Q Science > QC Physics
Q Science > QD Chemistry
Divisions: Faculty of Science > Chemistry
Faculty of Science > Physics
Library of Congress Subject Headings (LCSH): Perovskite -- Analysis
Journal or Publication Title: Applied Physics Letters
Publisher: American Institute of Physics
ISSN: 1077-3118
Official Date: 2012
Volume: Vol.101
Number: No.14
Number of Pages: 4
Page Range: p. 142902
Identification Number: 10.1063/1.4755882
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Funder: Advantage West Midlands (AWM), European Regional Development Fund (ERDF), Birmingham Science City
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URI: http://wrap.warwick.ac.uk/id/eprint/50167

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