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Unprecedented phase transition sequence in the perovskite Li0.2Na0.8NbO3
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dc.contributor.author | Dixon, Charlotte A. L. | |
dc.contributor.author | McNulty, Jason A. | |
dc.contributor.author | Huband, Steven | |
dc.contributor.author | Thomas, Pamela A. | |
dc.contributor.author | Lightfoot, Philip | |
dc.date.accessioned | 2017-03-21T10:30:12Z | |
dc.date.available | 2017-03-21T10:30:12Z | |
dc.date.issued | 2017-05 | |
dc.identifier | 249173682 | |
dc.identifier | 41b89e22-c4a8-43aa-bcce-c6c584751ae5 | |
dc.identifier | 85018247633 | |
dc.identifier | 000400460500005 | |
dc.identifier.citation | Dixon , C A L , McNulty , J A , Huband , S , Thomas , P A & Lightfoot , P 2017 , ' Unprecedented phase transition sequence in the perovskite Li 0.2 Na 0.8 NbO 3 ' , International Union of Crystallography Journal (IUCrJ) , vol. 4 , no. 3 , pp. 215-222 . https://doi.org/10.1107/S2052252517002226 | en |
dc.identifier.issn | 2052-2525 | |
dc.identifier.other | ORCID: /0000-0001-7048-3982/work/59464467 | |
dc.identifier.uri | https://hdl.handle.net/10023/10500 | |
dc.description | Funding for this research was provided by: EPSRC (award No. EP/L505079/1). | en |
dc.description.abstract | We demonstrate the existence of a novel phase transition sequence in the perovskite Li0.2Na0.8NbO3 at elevated temperature. The rare Glazer tilt system, a+a+c-, is observed in both polar and centrosymmetric polymorphs. 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 previously in perovskite crystallography, in both cases in compositions prepared at high pressure. | |
dc.format.extent | 1115111 | |
dc.language.iso | eng | |
dc.relation.ispartof | International Union of Crystallography Journal (IUCrJ) | en |
dc.subject | Perovskite | en |
dc.subject | Ferroelectric | en |
dc.subject | Powder neutron diffraction | en |
dc.subject | QD Chemistry | en |
dc.subject | DAS | en |
dc.subject | BDC | en |
dc.subject.lcc | QD | en |
dc.title | Unprecedented phase transition sequence in the perovskite Li0.2Na0.8NbO3 | en |
dc.type | Journal article | en |
dc.contributor.institution | University of St Andrews. School of Chemistry | en |
dc.contributor.institution | University of St Andrews. EaSTCHEM | en |
dc.identifier.doi | 10.1107/S2052252517002226 | |
dc.description.status | Peer reviewed | en |
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