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Title: Bismuth zinc niobate pyrochlore, a relaxor-like non-ferroelectric
Authors: Rozana Aina, Maulat Osman, Dr.
Maso, Nahum
West, Anthony R.
???metadata.dc.contributor.url???: rozana@unimap.edu.my
Keywords: Bismuth zinc niobate;Pyrochlore structures;Ferroelectricity;Impedance data;Constant phase element (CPE)
Issue Date: Jan-2012
Publisher: The American Ceramic Society
Citation: Journal of the American Ceramic Society, vol. 95 (1), 2012, pages 296-302
Abstract: Fixed frequency plots of ε and tan δ versus temperature for (Bi 1.5Zn 0.5)(Zn 0.5Nb 1.5)O 7 (BZN) ceramics with the pyrochlore structure show relaxor-like response below ∼180 K with frequency-independent permittivity of ∼130 above ∼180 K and over the frequency range of 10 3-10 6 Hz. Impedance data in the range, 10-180 K fit an equivalent circuit derived from the classic dielectric relaxation circuit in which the relaxation resistance is replaced by a constant phase element (CPE). Temperature dependence of the circuit parameters shows that BZN is not ferroelectric; the CPE, which is responsible for the relaxor-like behavior, gradually changes from primarily capacitive to primarily resistive with increasing temperature.
Description: Link to publisher's homepage at http://ceramics.org/
URI: http://onlinelibrary.wiley.com/doi/10.1111/j.1551-2916.2011.04779.x/pdf
ISSN: 0002-7820
Appears in Collections:School of Microelectronic Engineering (Articles)

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