Structure/property correlations in the new ferroelectric Bi5PbTi3O14Cl and related layered oxyhalide intergrowth phases

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Abstract

The crystal structure and electrophysical properties of the layered intergrowth phase Bi5PbTi3O14Cl have been studied using powder neutron diffraction, ac impedance and second harmonic generation methods. This phase adopts a structure based on a regular intergrowth of Aurivillius-like and Sillen-like blocks in the layer sequence ...[M2O2][M2Ti3O10][M2O2][ Cl]..., and is therefore closely structurally related to the well-known ferroelectric Bi4Ti3O12. The phase adopts the polar orthorhombic space group P2an at temperatures below 590 degreesC, and transforms directly to a centrosymmetric tetragonal phase, space group P4/mmm, at that temperature. This abrupt structural phase transition is consistent with a sudden loss of SHG signal and a dielectric maximum at the same temperature. The structural features and electrophysical behaviour of this phase in relation to Bi4Ti3O12 and related layered oxides/oxyhalides are discussed.

Original languageEnglish
Pages (from-to)3413-3418
Number of pages6
JournalJournal of Materials Chemistry
Volume12
DOIs
Publication statusPublished - 2002

Keywords

  • STRUCTURE REFINEMENT
  • BI4TI3O12
  • BI4NBO8CL

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