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Relaxor-to-ferroelectric crossover and disruption of polar order in "empty" tetragonal tungsten bronzes

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Gardner_et_al_Empty_TTB_ChemMater2016.pdf (2.132Mb)
Date
12/07/2016
Author
Gardner, Jonathan
Yu, Fengjiao
Tang, Chiu
Kockelmann, Winfried
Zhou, Wuzong
Morrison, Finlay D.
Keywords
QD Chemistry
DAS
BDC
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Abstract
Combined temperature-dependent structural and electrical characterization of a series of “empty” ferroelectric tetragonal tungsten bronzes (TTBs) of composition Ba4(La1- xNdx)0.67□1.33Nb10O30 are reported. The La-material exhibits a temperature dependent crossover from relaxor-ferroelectric to polar (but non-ferroelectric) to linear dielectric behavior. The loss of ferroelectric switching in the polar, non-ferroelectric phase is accompanied by disorder associated with structural relaxation due the significant vacancy concentration at the A1-perovskite-like site. In this disordered regime, large polarization can be re-established with application of sufficient electric field, however relaxation back into the disordered phase occurs on removal of the field as indicated by the loss of remenant polarization. The field against which “backswitching” (depolarization) occurs increases with temperature indicating increasing stability of the disordered regime. The disordered phase can be de-stabilized by substituting Nd for La at the A1-site and which reintroduces “normal” ferroelectric behavior.
Citation
Gardner , J , Yu , F , Tang , C , Kockelmann , W , Zhou , W & Morrison , F D 2016 , ' Relaxor-to-ferroelectric crossover and disruption of polar order in "empty" tetragonal tungsten bronzes ' , Chemistry of Materials , vol. 28 , no. 13 , pp. 4616-4627 . https://doi.org/10.1021/acs.chemmater.6b01306
Publication
Chemistry of Materials
Status
Peer reviewed
DOI
https://doi.org/10.1021/acs.chemmater.6b01306
ISSN
0897-4756
Type
Journal article
Rights
Copyright © 2016 American Chemical Society. This work is made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://dx.doi.org/10.1021/acs.chemmater.6b01306
Description
JG would like to thank the EPSRC for provision of a studentship via the doctoral training grant (EP/K503162/1). The research data (and/or materials) supporting this publication can be accessed at [http://dx.doi.org/10.17630/a7a9bc13-b5cb-485d-914a-923832f25190]
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  • University of St Andrews Research
URI
http://hdl.handle.net/10023/11193

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