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Issue 34, 2005
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Stoichiometry and doping mechanism of the cubic pyrochlore phase in the system Bi2O3–ZnO–Nb2O5

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Abstract

The subsolidus phase diagram of the system Bi2O3–ZnO–Nb2O5 in the region of the cubic pyrochlore phase has been determined at 950 °C. This phase forms a solid solution area that does not include the so-called ideal composition P, Bi3Zn2Nb3O14. It may be described in terms of two compositional variables: ZnO deficiency compared to P together with variable Bi : Nb ratio. Density measurements, preliminary crystallographic studies and the phase diagram indicate the solid solutions to have general formula, Bi3+yZn2−xNb3−yO14−xy: −0.11(1) ≤ y ≤ 0.14(1) and −0.03(1) ≤ x ≤ 0.31(1).

Graphical abstract: Stoichiometry and doping mechanism of the cubic pyrochlore phase in the system Bi2O3–ZnO–Nb2O5

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Publication details

The article was received on 25 Apr 2005, accepted on 01 Jul 2005 and first published on 26 Jul 2005


Article type: Paper
DOI: 10.1039/B505803C
J. Mater. Chem., 2005,15, 3501-3506

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    Stoichiometry and doping mechanism of the cubic pyrochlore phase in the system Bi2O3–ZnO–Nb2O5

    K. B. Tan, C. K. Lee, Z. Zainal, G. C. Miles and A. R. West, J. Mater. Chem., 2005, 15, 3501
    DOI: 10.1039/B505803C

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