Synthesis and structural studies of lanthanide substituted bismuth-titanium pyrochlores

Jimmy Ting; Brendan J. Kennedy; Ray L. Withers; Maxim Avdeev

doi:10.1016/j.jssc.2008.12.030

Synthesis and structural studies of lanthanide substituted bismuth-titanium pyrochlores

Jimmy Ting, Brendan J. Kennedy^*, Ray L. Withers, Maxim Avdeev

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

Abstract

The identity of the pyrochlore phase seen during the synthesis of ferroelectric Bi_4-xLn_xTi₃O₁₂ Aurivillius oxides is shown to be Bi_2/3Ln_4/3Ti₂O₇. 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 diffraction data, of three examples Ln³⁺=Eu, Ho and Yb are presented.

Original language	English
Pages (from-to)	836-840
Number of pages	5
Journal	Journal of Solid State Chemistry
Volume	182
Issue number	4
DOIs	https://doi.org/10.1016/j.jssc.2008.12.030
Publication status	Published - Apr 2009

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10.1016/j.jssc.2008.12.030

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title = "Synthesis and structural studies of lanthanide substituted bismuth-titanium pyrochlores",

abstract = "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 diffraction data, of three examples Ln3+=Eu, Ho and Yb are presented.",

keywords = "Bismuth pyrochlore, Crystal structure, Ferroelectric, Lanthanide substituted bismuth titanate",

author = "Jimmy Ting and Kennedy, {Brendan J.} and Withers, {Ray L.} and Maxim Avdeev",

year = "2009",

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language = "English",

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TY - JOUR

T1 - Synthesis and structural studies of lanthanide substituted bismuth-titanium pyrochlores

AU - Ting, Jimmy

AU - Kennedy, Brendan J.

AU - Withers, Ray L.

AU - Avdeev, Maxim

PY - 2009/4

Y1 - 2009/4

N2 - 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 diffraction data, of three examples Ln3+=Eu, Ho and Yb are presented.

AB - 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 diffraction data, of three examples Ln3+=Eu, Ho and Yb are presented.

KW - Bismuth pyrochlore

KW - Crystal structure

KW - Ferroelectric

KW - Lanthanide substituted bismuth titanate

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U2 - 10.1016/j.jssc.2008.12.030

DO - 10.1016/j.jssc.2008.12.030

M3 - Article

SN - 0022-4596

VL - 182

SP - 836

EP - 840

JO - Journal of Solid State Chemistry

JF - Journal of Solid State Chemistry

IS - 4

ER -

Synthesis and structural studies of lanthanide substituted bismuth-titanium pyrochlores

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