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dc.contributor.authorMcNulty, Jason A.
dc.contributor.authorPesquera, David
dc.contributor.authorGardner, Jonathan
dc.contributor.authorRotaru, Andrei
dc.contributor.authorPlayford, Helen Y.
dc.contributor.authorTucker, Matthew G.
dc.contributor.authorCarpenter, Michael A.
dc.contributor.authorMorrison, Finlay D.
dc.identifier.citationMcNulty , J A , Pesquera , D , Gardner , J , Rotaru , A , Playford , H Y , Tucker , M G , Carpenter , M A & Morrison , F D 2020 , ' Local structure and order-disorder transitions in "empty" ferroelectric tetragonal tungsten bronzes ' , Chemistry of Materials , vol. 32 , no. 19 , pp. 8492-8501 .
dc.identifier.otherPURE: 270110633
dc.identifier.otherPURE UUID: 990ed683-b0ce-43d5-90e6-8ca35a9af584
dc.identifier.otherORCID: /0000-0002-2813-3142/work/80620062
dc.identifier.otherWOS: 000580949200043
dc.identifier.otherScopus: 85095843513
dc.descriptionJAM would like to acknowledge the School of Chemistry, University of St Andrews for the allocation of a PhD studentship through the EPSRC doctoral training grant (EP/K503162/1). AR would like to acknowledge support through the Strategic Grant POSDRU/159/1.5/S/133255, Project ID 133255 (2014), co-financed by the European Social Fund within the Sectorial Operational Program Human Resources Development 2007–2013 and also the University of Craiova and University of Cambridge for the mobility grant “Resonant ultrasound spectroscopy. (RUS) characterization of dielectric and ferroelectric tetragonal tungsten bronzes”. The work carried out at the University of St Andrews and University of Cambridge is part of an EPSRC- funded collaboration (EP/P02453X/1 and EP/P024904/1).en
dc.description.abstractThe ‘empty’ tetragonal tungsten bronze Ba4La0.67 1.33Nb10O30 displays both relaxor-like and normal dielectric anomalies as a function of temperature; the former is associated with loss of ferroelectricity and was proposed to originate from anion disordering [Chem. Mater., 2016, 28 , 4616-4627]. Here we present total neutron scattering and pair distribution function (PDF) analysis which shows an increase in the distribution of oxygen-oxygen distances at the relaxor transition and which supports the proposed anion disordering mechanism. The disordering process can be destabilised by reducing the average A-cation size (i.e. Nd-doping: Ba4(La1-xNdx)0.67Nb10O30); this introduces a more strongly propagating tilt system in line with the previously reported crystal-chemical framework model [Chem. Mater., 2015, 27 , 3250-3261]. Mechanical loss data obtained using resonant ultrasound spectroscopy also indicate destabilisation of the disordering process with increasing Nd-substitution.
dc.relation.ispartofChemistry of Materialsen
dc.rightsCopyright © 2020 American Chemical Society. This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the author created accepted manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at
dc.subjectQD Chemistryen
dc.titleLocal structure and order-disorder transitions in "empty" ferroelectric tetragonal tungsten bronzesen
dc.typeJournal articleen
dc.contributor.institutionUniversity of St Andrews. School of Chemistryen
dc.contributor.institutionUniversity of St Andrews. EaSTCHEMen
dc.description.statusPeer revieweden

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