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Synthesis and structural studies of lanthanide substituted bismuth-titanium pyrochlores.

Ting, Jimmy; Kennedy, Brendan James; Withers, Raymond; Avdeev, Maxim


The identity of the pyrochlore phase seen during the synthesis of ferroelectric Bi4-xLnxTi3O12 Aurivillius oxides is shown to be Bi2/3Ln4/3Ti2O7. This pyrochlore is only stable for Ln3+=Sm3+ or smaller. For larger lanthanides the layered Aurivillius oxide is favoured. The presence of six-fold disorder, associated with the Bi 6s2 lone pair electrons, is believed to stabilise the unexpected stoichiometry of this oxide. Precise structures, obtained by Rietveld refinement from synchrotron X-ray...[Show more]

CollectionsANU Research Publications
Date published: 2009
Type: Journal article
Source: Journal of Solid State Chemistry
DOI: 10.1016/j.jssc.2008.12.030


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