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A crystal-chemical framework for relaxor versus normal ferroelectric behavior in tetragonal tungsten bronzes

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ChemMater_2015_TTB_overview.pdf (6.078Mb)
Date
12/05/2015
Author
Zhu, X.
Fu, M.
Stennett, M. C.
Vilarinho, P. M.
Levin, I.
Randall, C. A.
Gardner, Jonathan
Morrison, F. D.
Reaney, I. M.
Keywords
QD Chemistry
NDAS
Metadata
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Abstract
Tetragonal Tungsten Bronzes (TTBs) - an important class of oxides known to exhibit ferroelectricity - undergo complex distortions, including rotations of oxygen octahedra, which give rise to either incommensurately or commensurately modulated superstructures. Many TTBs display broad, frequency-dependent relaxor dielectric behaviour rather than sharper frequency-independent normal ferroelectric anomalies but the exact reasons that favor a particular type of dielectric response for a given composition remain unclear. In this contribution the influence of incommensurate/commensurate displacive modulations on the onset of relaxor/ferroelectric behaviour in TTBs is assessed in the context of basic crystal-chemical factors, such as positional disorder, ionic radii and polarizabilities, and point defects. We present a predictive crystal-chemical model that rationalizes composition-structure-properties relations for a broad range of TTB systems.
Citation
Zhu , X , Fu , M , Stennett , M C , Vilarinho , P M , Levin , I , Randall , C A , Gardner , J , Morrison , F D & Reaney , I M 2015 , ' A crystal-chemical framework for relaxor versus normal ferroelectric behavior in tetragonal tungsten bronzes ' Chemistry of Materials , vol. 27 , no. 9 , pp. 3250-3261 . DOI: 10.1021/acs.chemmater.5b00072
Publication
Chemistry of Materials
Status
Peer reviewed
DOI
https://doi.org/10.1021/acs.chemmater.5b00072
ISSN
0897-4756
Type
Journal article
Rights
This document is the Accepted Manuscript version of a Published Work that appeared in final form in Chemistry of Materials, copyright © 2015 American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see http://dx.doi.org/10.1021/acs.chemmater.5b00072
Collections
  • Chemistry Research
  • University of St Andrews Research
URI
http://hdl.handle.net/10023/8589

Items in the St Andrews Research Repository are protected by copyright, with all rights reserved, unless otherwise indicated.

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