Structures and solid solution mechanisms of pyrochlore phases in the systems Bi2O3-ZnO-(Nb, Ta)2O5

Citation

Tan, Kar Ban and Khaw, Chwin Chieh and Lee, Chnoong Kheng and Zainal, Zulkarnain and Miles, Gabrielle (2010) Structures and solid solution mechanisms of pyrochlore phases in the systems Bi2O3-ZnO-(Nb, Ta)2O5. Journal of Alloys and Compounds, 508 (2). pp. 457-462. ISSN 0925-8388

Abstract

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.

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Additional Metadata

Item Type:	Article
Subject:	Solid state chemistry
Subject:	Ceramics
Subject:	Pyrochlore
Divisions:	Faculty of Science
DOI Number:	https://doi.org/10.1016/j.jallcom.2010.08.093
Publisher:	Elsevier
Keywords:	Ceramics; Solid state reaction; Crystal structure; Pyrochlore; X-ray and neutron diffractions.
Depositing User:	Najwani Amir Sariffudin
Date Deposited:	21 Jan 2013 08:28
Last Modified:	19 Jan 2016 02:55
Altmetrics:	http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.1016/j.jallcom.2010.08.093
URI:	http://psasir.upm.edu.my/id/eprint/16873
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