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Synthesis and electrical properties of Zn-substituted bismuth copper tantalate pyrochlores


Chon, Mun Ping and Tan, Kar Ban and Zainal, Zulkarnain and Yap, Taufiq Yun Hin and Tan, Phei Yi and Khaw, Chwin Chieh and Chen, Soo Kien (2016) Synthesis and electrical properties of Zn-substituted bismuth copper tantalate pyrochlores. International Journal of Applied Ceramic Technology, 13 (4). pp. 718-725. ISSN 1546-542X; ESSN: 1744-7402


A complete substitutional solid solution, Bi3.08Cu1.84−xZnxTa3.08O14.16: 0 ≤ x ≤ 1.84, was prepared by solid-state reaction at temperature 950°C over 48 h. These thermally stable pyrochlores exhibited a remarkable transition from semiconducting to highly insulating behavior as their electrical conductivities varied by many orders of magnitude depending on the Zn concentration. The recorded activation energies increased from 0.40 to 1.40 eV, while the dielectric constants, ε′, and losses, tan δ, were in the range 50–70 and of order 10−3–10−2 at 1 MHz and ambient temperature, ~25°C, respectively.

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Additional Metadata

Item Type: Article
Subject: Impedance; Electroceramics; Solubility; Tantalum/tantalum compounds
Divisions: Faculty of Science
DOI Number: https://doi.org/10.1111/ijac.12547
Publisher: The American Ceramic Society
Depositing User: Nurul Ainie Mokhtar
Date Deposited: 22 Feb 2018 07:03
Last Modified: 22 Feb 2018 07:03
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.1111/ijac.12547
URI: http://psasir.upm.edu.my/id/eprint/53958
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