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Reaction study and phase formation in Bi2O3-ZnO-Nb2O5 ternary system


Citation

Tan, Kar Ban and Lee, Chnoong Kheng and Zainal, Zulkarnain and Khaw, Chwin Chieh and Tan, Yen Ping and Shaari, H. (2008) Reaction study and phase formation in Bi2O3-ZnO-Nb2O5 ternary system. Pacific Journal of Science and Technology, 9 (2). pp. 468-479. ISSN 1551-7624

Abstract

The formation of two structurally related phases; cubic pyrochlore and monoclinic zirconolite in Bi2O3-ZnO-Nb2O5 (BZN) ternary system was investigated. Phase pure Bi4Zn4/3Nb8/3O14 synthesized via conventional solid state methods at 950oC was refined and fully indexed with space group C2 /c; lattice parameters, a = 13.1109(3) Ǻ, b = 7.6764(2) Ǻ, c = 12.1528(2) Ǻ and α = γ = 90C and β = 101.33o, respectively. Reaction study revealed that Bi5Nb3O15 and BiNbO4 phases are two important precursors that react with ZnO at higher temperatures during phase formation. The pyrochlore does not form at the conventionally predicted composition Bi4Zn4/3Nb8/3O14, which falls in the zirconolite region. Instead, cubic pyrochlore forms at substantially lower Bi concentrations in BZN system. The two interrelated areas, a trapezoidal cubic pyrochlore subsolidus, and a rectangular shaped monoclinic zirconolite subsolidus serve to confirm the data consistency over various phase assemblages and compatibility in the phase diagram.


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Additional Metadata

Item Type: Article
Divisions: Faculty of Science
Publisher: Akamai University
Keywords: Diagram; Pyrochlores; Monoclinic zirconolite; Subsolidus
Depositing User: Nabilah Mustapa
Date Deposited: 12 Apr 2016 05:05
Last Modified: 12 Apr 2016 05:05
URI: http://psasir.upm.edu.my/id/eprint/42231
Statistic Details: View Download Statistic

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