unprecedented phase transition sequence in the perovskite li0.2na0.8nbo3
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ID: 178965
2017
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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.
| Reference Key |
dixon2017iucrjunprecedented
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| Authors | ;Charlotte A. L. Dixon;Jason A. McNulty;Steven Huband;Pamela A. Thomas;Philip Lightfoot |
| Journal | european journal of orthopaedic surgery & traumatology : orthopedie traumatologie |
| Year | 2017 |
| DOI |
10.1107/S2052252517002226
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