کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1329364 978907 2009 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Synthesis and structural studies of lanthanide substituted bismuth–titanium pyrochlores
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی معدنی
پیش نمایش صفحه اول مقاله
Synthesis and structural studies of lanthanide substituted bismuth–titanium pyrochlores
چکیده انگلیسی

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.

Graphical AbstractThe pyrochlore phase formed during the synthesis of the ferroelectric oxides Bi4−xLnxTi3O12 is shown to be Bi2/3Ln4/3Ti2O7. This is found to be stable only for Ln3+cations smaller than Sm3+. Displacive disorder of the Bi and Ln cations is observed.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Solid State Chemistry - Volume 182, Issue 4, April 2009, Pages 836–840
نویسندگان
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