Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/15058
Title: Effects of grain size on the dielectric properties and tunabilities of sol-gel derived Ba(Zr0.2Ti0.8)O3 ceramics
Authors: Tang, XG
Wang, J
Wang, XX
Chan, HLW 
Keywords: BZT ceramic
Dielectric properties
Dielectric resonance
Issue Date: 2004
Publisher: Pergamon Press
Source: Solid state communications, 2004, v. 131, no. 3-4, p. 163-168 How to cite?
Journal: Solid state communications 
Abstract: Barium zirconante titanate Ba(Zr0.2Ti0.8)O 3 (BZT) ceramics were prepared using a sol-gel process. The effect of grain size and dc field on the dielectric properties of BZT ceramics were investigated. The coarse-grained sample undergoes a structural phase transition, but medium- and fine-grained samples showed diffuse phase transition characteristics. As the grain size decreased, the maximum dielectric constant and the transition temperature decreased. The fine-grained sample showed a 'relaxor-like' ferroelectric behavior, the dielectric relaxation rate follows the Vogel-Fulcher relation with Ea=0.032eV, Tvf=253.2K, and ν0=2.63×1013Hz. The dielectric constant is greatly suppressed and low loss is obtained under dc electric field. At room temperature (300 K) and 20 kV/cm, the tunability (k) and loss tanδ are 82% and 0.0034 for the coarse-grained sample.
URI: http://hdl.handle.net/10397/15058
ISSN: 0038-1098
EISSN: 1879-2766
DOI: 10.1016/j.ssc.2004.05.016
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