Effect of local A-site strain on dipole stability in A6GaNb9O30 (A = Ba, Sr, Ca) tetragonal tungsten bronze relaxor dielectrics

Andrew J. Miller , Andrei Rotaru, Donna Claire Arnold, Finlay D. Morrison

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)
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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.

Original languageEnglish
Pages (from-to)10738-10745
JournalDalton Transactions
Volume44
Issue number23
Early online date9 Feb 2015
DOIs
Publication statusPublished - 21 Jun 2015

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