کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1619269 1005718 2010 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Structures and solid solution mechanisms of pyrochlore phases in the systems Bi2O3–ZnO–(Nb, Ta)2O5
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
Structures and solid solution mechanisms of pyrochlore phases in the systems Bi2O3–ZnO–(Nb, Ta)2O5
چکیده انگلیسی

The crystal structures of two pyrochlore phases have been determined by Rietveld refinement of combined X-ray and neutron powder diffraction data. These are stoichiometric, Bi1.5 ZnTa1.5O7 and non-stoichiometric Bi1.56Zn0.92Nb1.44O6.86. In both structures, Zn is distributed over A- and B-sites; Bi and Zn are displaced off-centre, to different 96g A-site positions; of the three sets of oxygen positions, O(1) are full, O(2) contain vacancies and O(3) contain a small number of oxygen, again in both cases. Comparisons between these structures, those of related Sb analogues and literature reports are made.

Research highlights▶ Combined XRD and ND Rietveld structural refinement of pyrochlores. ▶ Structures and solid solution mechanisms of Bi-pyrochlores. ▶ Bi and Zn displaced off-centre to different 96g A-site positions. ▶ Summary of composition-structure-property of Bi-pyrochlores.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 508, Issue 2, 22 October 2010, Pages 457–462
نویسندگان
, , , , ,