Pyrochlore Phase Formation in the System Bi2O3–ZnO–Ta2O5 |
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| Authors: | C. C. Khaw C. K. Lee Z. Zainal G. C. Miles A. R. West |
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| Affiliation: | Department of Chemistry, Universiti Putra Malaysia, Malaysia; Department of Engineering Materials, University of Sheffield, Sheffield, UK |
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| Abstract: | The subsolidus phase diagram of the system Bi2O3–ZnO–Ta2O5 in the region of the cubic pyrochlore phase has been determined at 1050°C. This phase forms a solid solution area that includes the ideal composition P, Bi3Zn2Ta3O14; possible solid solution mechanisms are proposed, supported by density measurements of Zn-deficient solid solutions. The general formula of the solid solutions is Bi3+ y Zn2− x Ta3− y O14− x − y , based on the creation of Zn2+, O2− vacancies in Zn-deficient compositions and a variable Bi/Ta ratio. |
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