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Synthesis and structural studies of lanthanide substituted bismuth-titanium pyrochlores |
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| Authors: | Jimmy Ting Ray L. Withers |
| Affiliation: | a School of Chemistry, The University of Sydney, Sydney, NSW 2006, Australia b Research School of Chemistry, Australian National University, Canberra, ACT 0200, Australia c Bragg Institute, Australian Nuclear Science and Technology Organisation, Private Mail Bag 1, Menai, NSW 2234, Australia |
| 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 Lanthanide substituted bismuth titanate Crystal structure Ferroelectric |
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