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Jenny Tellier, Philippe Boullay, Danièle Mercurio

Crystal structure of the Aurivillius phases in the system Bi₄Ti₃O₁₂—PbTiO₃

Keywords: Ferroelectrics, Bismuth layered oxides, Modulated structures, Aurivillius phases, Powder diffraction structure analysis

The crystal structure of four Aurivillius phases within the pseudo-binary system Bi₄Ti₃O₁₂—PbTiO₃ is examined using a 3 + 1D approach where these phases are treated as commensurately modulated layered structures. The structure of PbBi₄Ti₄O₁₅, Pb₂Bi₄Ti₅O₁₈, Pb₃Bi₄Ti₆O₂₁ and PbBi₈Ti₇O₂₇ are refined by the Rietveld method using XRPD data from single phased powders. The structure of Pb₃Bi₄Ti₆O₂₁ and PbBi₈Ti₇O₂₇ is reported for the first time. When the lead content increases, the structure gets less distorted and approaches the prototype paraelectric phase in an apparent close relation with the onset of a “relaxor-like” ferroelectric behaviour. For these relaxor compounds, SAED investigation evidences the existence of a disorder in the form of micro-twinning.

Zeitschrift für Kristallographie, Oldenbourg Wissenschaftsverlag

Print ISSN: 0044-2968
Volume: 222, 05/2007
Pages: 234 - 243

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