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|Title: ||Bismuth zinc niobate pyrochlore, a relaxor-like non-ferroelectric|
|Authors: ||Rozana Aina, Maulat Osman, Dr.|
West, Anthony R.
|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/|
|Appears in Collections:||School of Microelectronic Engineering (Articles)|
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