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dc.contributor.authorDixon, Charlotte A. L.
dc.contributor.authorMcNulty, Jason A.
dc.contributor.authorHuband, Steven
dc.contributor.authorThomas, Pamela A.
dc.contributor.authorLightfoot, Philip
dc.date.accessioned2017-03-21T10:30:12Z
dc.date.available2017-03-21T10:30:12Z
dc.date.issued2017-05
dc.identifier249173682
dc.identifier41b89e22-c4a8-43aa-bcce-c6c584751ae5
dc.identifier85018247633
dc.identifier000400460500005
dc.identifier.citationDixon , 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/S2052252517002226en
dc.identifier.issn2052-2525
dc.identifier.otherORCID: /0000-0001-7048-3982/work/59464467
dc.identifier.urihttps://hdl.handle.net/10023/10500
dc.descriptionFunding for this research was provided by: EPSRC (award No. EP/L505079/1).en
dc.description.abstractWe 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.extent1115111
dc.language.isoeng
dc.relation.ispartofInternational Union of Crystallography Journal (IUCrJ)en
dc.subjectPerovskiteen
dc.subjectFerroelectricen
dc.subjectPowder neutron diffractionen
dc.subjectQD Chemistryen
dc.subjectDASen
dc.subjectBDCen
dc.subject.lccQDen
dc.titleUnprecedented phase transition sequence in the perovskite Li0.2Na0.8NbO3en
dc.typeJournal articleen
dc.contributor.institutionUniversity of St Andrews. School of Chemistryen
dc.contributor.institutionUniversity of St Andrews. EaSTCHEMen
dc.identifier.doi10.1107/S2052252517002226
dc.description.statusPeer revieweden


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