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Investigation of structural and dielectric properties of subsolidus bismuth iron niobate pyrochlores


Jusoh, Farah Aishah and Tan, Kar Ban and Zainal, Zulkarnain and Chen, Soo Kien and Khaw, Chwin Chieh and Lee, Onn Jew (2020) Investigation of structural and dielectric properties of subsolidus bismuth iron niobate pyrochlores. Journal of Asian Ceramic Societies, 8 (3). 957 - 969. ISSN 2187-0764


Subsolidus Bi3.36Fe2.08+xNb2.56−xO14.56−x (BFN) pyrochlores prepared by solid-state reaction at 950°C over 48 h showed a moderate solid solution range of −0.24 ≤ x ≤ 0.48. As to preserve the overall charge electroneutrality of the system, the doping mechanism was proposed to be a one-to-one substitution of Nb5+ by Fe3+ together with oxygen non-stoichiometry, i.e. Nb5+ ↔ Fe3+ − O2–. BFN pyrochlores crystallized in a cubic symmetry, space group Fdm (No. 227), Z = 4 and their refined lattice constants were found to be in the range 10.5071 (4)–10.5107 (7) Å. The microstructural analyses revealed their grain size range 0.5–8.4 μm and crystallite size range 63−78 nm, respectively. These thermally stable BFN pyrochlores exhibited moderate high dielectric constants, ε’ in the range 141–150 and dielectric losses, tan δ ~ 0.2 at ~30°C and 1 MHz.

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Additional Metadata

Item Type: Article
Divisions: Faculty of Science
DOI Number: https://doi.org/10.1080/21870764.2020.1799914
Publisher: Taylor and Francis
Keywords: Pyrochlores; Solid-state method; Electrical properties; Niobate compounds
Depositing User: Ms. Nuraida Ibrahim
Date Deposited: 18 Aug 2021 05:17
Last Modified: 18 Aug 2021 05:17
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.1080/21870764.2020.1799914
URI: http://psasir.upm.edu.my/id/eprint/89452
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