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Title: Synthesis and structural studies of lanthanide substituted bismuth-titanium pyrochlores
Authors: Ting, J
Kennedy, BJ
Withers, RL
Avdeev, M
Keywords: Crystal structure
Thin films
X-ray diffraction
Rare earths
Issue Date: Apr-2009
Publisher: Elsevier
Citation: Ting, J., Kennedy, B. J., Withers, R. L., & Avdeev, M. (2009). Synthesis and structural studies of lanthanide substituted bismuth-titanium pyrochlores. Journal of Solid State Chemistry, 182(4), 836-840. doi:10.1016/j.jssc.2008.12.030
Abstract: The identity of the pyrochlore phase seen during the synthesis of ferroelectric Bi(4-x)Ln(x)Ti(3)O(12) Aurivillius oxides is shown to be Bi(2/3)Ln(4/3)Ti(2)O(7). This pyrochlore is only stable for Ln(3+) = Sm3+ or smaller. For larger lanthanides the layered Aurivillius oxide is favoured. The presence of six-fold disorder, associated with the Bi 6s(2) lone pair electrons, is believed to stabilise the unexpected stoichiometry of this oxide. Precise structures, obtained by Rietveld refinement from synchrotron X-ray diffraction data, of three examples Ln(3+) = Eu, Ho and Yb are presented. © 2009, Elsevier Ltd.
Gov't Doc #: 1351
ISSN: 0022-4596
Appears in Collections:Journal Articles

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