Show simple item record

Files in this item


Item metadata

dc.contributor.authorHowieson, Grant William
dc.contributor.authorWu, Shitao
dc.contributor.authorGibbs, Alexandra S
dc.contributor.authorZhou, Wuzong
dc.contributor.authorScott, James Floyd
dc.contributor.authorMorrison, Finlay D.
dc.identifier.citationHowieson , G W , Wu , S , Gibbs , A S , Zhou , W , Scott , J F & Morrison , F D 2020 , ' Incommensurate-commensurate transition in the geometric ferroelectric LaTaO 4 ' , Advanced Functional Materials , vol. 30 , no. 45 , 2004667 .
dc.identifier.otherPURE: 269029535
dc.identifier.otherPURE UUID: bbb55d70-274b-4dbd-9e01-f83724e271d5
dc.identifier.otherORCID: /0000-0001-9752-7076/work/80257409
dc.identifier.otherORCID: /0000-0002-2813-3142/work/80257538
dc.identifier.otherWOS: 000566413000001
dc.identifier.otherScopus: 85090202577
dc.descriptionFunding: UK Engineering and Physical Sciences Research Council (Grant Number(s): EP/P022637/1, EP/K503162/1), Science and Technology Facilities Council (Grant Number(s): RB1820307), China Scholarship Council (CN).en
dc.description.abstractThe layered perovskite LaTaO4 has been synthesized to be stable in both (polar) orthorhombic and (nonpolar) monoclinic polymorphs at ambient conditions. Although the structural transition between monoclinic and orthorhombic phases has been well established, there is some controversy regarding a further, unidentified transition around 500 K. Here this is identified as an incommensurate–commensurate first‐order transition between incommensurate Cmc21(α00)0s0 and commensurate Cmc21 orthorhombic phases. Transmission electron microscopy indicates partially ordered stacking of different structural units in a, identifying the local cause for the modulation, whereas variable temperature powder neutron diffraction has shown the overall macroscopic modulation vector, q ≈ (0.456, 0, 0)—roughly a 2.2 × expansion in a, corresponding to an approximate 11a commensurate superunit cell dimension. The modulation shows a continuous temperature dependence until transitioning to the basic (commensurate) cell at TIC‐C. Doping the interlayer La sites with smaller Nd cations stabilizes the incommensuration to higher temperature, suggesting the modulation is geometrically driven at the A site.
dc.relation.ispartofAdvanced Functional Materialsen
dc.rightsCopyright © 2020 The Authors. Published by Wiley‐VCH GmbH. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.en
dc.subjectStructure-property relationshipsen
dc.subjectQD Chemistryen
dc.subjectTK Electrical engineering. Electronics Nuclear engineeringen
dc.titleIncommensurate-commensurate transition in the geometric ferroelectric LaTaO4en
dc.typeJournal articleen
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews. School of Chemistryen
dc.contributor.institutionUniversity of St Andrews. EaSTCHEMen
dc.description.statusPeer revieweden

This item appears in the following Collection(s)

Show simple item record