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Unprecedented phase transition sequence in the perovskite Li0.2Na0.8NbO3
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Dixon, C. S. L, McNulty, J. A. , Huband, Steven, Thomas, Pam A. and Lightfoot, Philip (2017) Unprecedented phase transition sequence in the perovskite Li0.2Na0.8NbO3. IUCrJ, 4 (3). pp. 215-222. doi:10.1107/S2052252517002226 ISSN 2052-2525.
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Official URL: http://doi.org/10.1107/S2052252517002226
Abstract
The perovskite Li0.2Na0.8NbO3 is shown, by powder neutron diffraction, to display a unique sequence of phase transitions at elevated temperature. The ambient temperature polar phase (rhombohedral, space group R3c) transforms via a first-order transition to a polar tetragonal phase (space group P42mc) in the region 150–300°C; these two phases correspond to Glazer tilt systems a−a−a− and a+a+c−, respectively. At 500°C a ferroelectric–paraelectric transition takes place from P42mc to P42/nmc, retaining the a+a+c− tilt. Transformation to a single-tilt system, a0a0c+ (space group P4/mbm), occurs at 750°C, with the final transition to the aristotype cubic phase at 850°C. The P42mc and P42/nmc phases have each been seen only once and twice each, respectively, in perovskite crystallography, in each case in compositions prepared at high pressure.
Item Type: | Journal Article | ||||||||
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Subjects: | Q Science > QC Physics Q Science > QD Chemistry |
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||
Library of Congress Subject Headings (LCSH): | Perovskite -- Analysis, Neutrons -- Diffraction | ||||||||
Journal or Publication Title: | IUCrJ | ||||||||
Publisher: | International Union of Crystallography | ||||||||
ISSN: | 2052-2525 | ||||||||
Official Date: | May 2017 | ||||||||
Dates: |
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Volume: | 4 | ||||||||
Number: | 3 | ||||||||
Page Range: | pp. 215-222 | ||||||||
DOI: | 10.1107/S2052252517002226 | ||||||||
Status: | Peer Reviewed | ||||||||
Publication Status: | Published | ||||||||
Access rights to Published version: | Open Access (Creative Commons) | ||||||||
Date of first compliant deposit: | 11 August 2017 | ||||||||
Date of first compliant Open Access: | 11 August 2017 | ||||||||
Funder: | Science and Technology Facilities Council (Great Britain) (STFC) |
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