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

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Author(s)

Jonathan Gardner, Fengjiao Yu, Chiu Tang, Winfried Kockelmann, Wuzong Zhou, Finlay D. Morrison

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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)0.671.33Nb10O30 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.
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Details

Original languageEnglish
Pages (from-to)4616-4627
Number of pages12
JournalChemistry of Materials
Volume28
Issue number13
Early online date6 Jun 2016
DOIs
Publication statusPublished - 12 Jul 2016

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