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Phase formation and dielectric properties of pentavalent cation doped non-stoichiometric Bismuth Zinc Niobate (BZN) cubic pyrochlore.


Citation

Tan, Kar Ban and Khaw, C.C. and Lee, C.K. and Zainal, Zulkarnain and Shaari, H. (2009) Phase formation and dielectric properties of pentavalent cation doped non-stoichiometric Bismuth Zinc Niobate (BZN) cubic pyrochlore. Sains Malaysiana, 38 (2). pp. 219-226. ISSN 0126-6039

Abstract

In an attempt to synthesize new solid solutions and search for better performance materials, pentavalent cation dopants were introduced into the non stoichiometric BZN cubic pyrochlore, Bi3Zn1.84Nb3O13.84. Extensive solid solutions were formed in Bi3Zn1.84Nb3-xDxO13.84 with limit at x = 3 and 2.6 for D = Ta and Sb, respectively. This illustrates the possibility of cationexchange solid solutions due to similarity in dopants’ ionic radii. The elemental analysis confirmed the stoichiometry of doped materials with no deleterious Bi2O3 loss. Ta / Sb doped samples were highly resistive with activation energies ranging from 1.2 - 1.9 eV. Temperature coefficient of capacitance, TCC, decreased from -396 ppm / oC to ~ -180 ppm / oC and ~ -90 ppm / oC for both end members, respectively.


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Additional Metadata

Item Type: Article
Divisions: Faculty of Science
Publisher: Universiti Kebangsaan Malaysia
Keywords: Pyrochlore; Solid solutions; Electroceramics; Chemical doping.
Depositing User: Najwani Amir Sariffudin
Date Deposited: 21 Aug 2013 09:12
Last Modified: 20 Jan 2016 02:27
URI: http://psasir.upm.edu.my/id/eprint/16172
Statistic Details: View Download Statistic

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