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Phase equilibria in the Bi2O3-CuO-Nb2O5 ternary system


Tan, Kar Ban and Chon, Mun Ping and Khaw, Chwin Chieh and Zainal, Zulkarnain and Yap, Taufiq Yun Hin and Chen, Soo Kien and Tan, Phei Yi (2017) Phase equilibria in the Bi2O3-CuO-Nb2O5 ternary system. Ceramics International, 43 (6). pp. 4930-4936. ISSN 0272-8842; ESSN: 1873-3956


A complete subsolidus ternary phase diagram of the Bi2O3-CuO-Nb2O5 (BCN) system was constructed. Careful firing control and phase analysis were applied to determine the phase assemblages and compatibilities over a wide range of temperatures, i.e. 700–925 °C. Phase-pure BCN pyrochlores were found to crystallise in cubic symmetry, space group Fd3m, No. 227 with lattice constants in the range of 10.4855 (5)<x<10.5321 (3). The mechanism of this limited subsolidus series could be represented by a general formula, Bi3.08−xCu1.84+2x/9Nb3.08+7x/9O14.16+6x/9 (0≤x≤0.36) wherein the reduction in Bi content was compensated by a proportion amount of copper and niobium together with non-stoichiometry in oxygen.

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Additional Metadata

Item Type: Article
Divisions: Faculty of Science
DOI Number: https://doi.org/10.1016/j.ceramint.2016.12.147
Publisher: Elsevier
Keywords: Ceramics; Sintering; Powder diffraction; Phase equilibria
Depositing User: Nabilah Mustapa
Date Deposited: 11 Jun 2018 08:33
Last Modified: 11 Jun 2018 08:33
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.1016/j.ceramint.2016.12.147
URI: http://psasir.upm.edu.my/id/eprint/13456
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