Effect of local A-site strain on dipole stability in A6GaNb9O30 (A = Ba, Sr, Ca) tetragonal tungsten bronze relaxor dielectrics
View/ Open
Date
21/06/2015Funder
Grant ID
EP/F004133/1
Metadata
Show full item recordAltmetrics Handle Statistics
Altmetrics DOI Statistics
Abstract
A series of isovalently A-site substituted relaxor dielectric tetragonal tungsten bronzes of general formula Ba6-x-ySrxCayGaNb9O30 were investigated. The long-range (average) crystal structure as determined by conventional diffraction techniques varies monotonically according to Vegard’s law. The dielectric properties, however, do not display a similar, simple “average size” dependence and instead show a dependence on the statistical size variance, i.e. size mismatch, of the A-cation. The difficulties in Vogel-Fulcher analysis of relative permittivity and the complementary approach of using dielectric loss data fitted to Jonscher’s empirical Universal Dielectric Relaxation model is discussed.
Citation
Miller , A J , Rotaru , A , Arnold , D C & Morrison , F D 2015 , ' Effect of local A-site strain on dipole stability in A 6 GaNb 9 O 30 (A = Ba, Sr, Ca) tetragonal tungsten bronze relaxor dielectrics ' , Dalton Transactions , vol. 44 , no. 23 , pp. 10738-10745 . https://doi.org/10.1039/C4DT03936J
Publication
Dalton Transactions
Status
Peer reviewed
ISSN
1477-9226Type
Journal article
Rights
Copyright 2015 the Authors. This open access article is licensed under a Creative Commons Attribution 3.0 Unported Licence (http://creativecommons.org/licenses/by/3.0/).
Description
The authors would like to acknowledge EaStCHEM and EPSRC for financial support.Collections
Items in the St Andrews Research Repository are protected by copyright, with all rights reserved, unless otherwise indicated.