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Title: Effect of grain size on the electrical properties of (Ba,Ca)(Zr,Ti)O₃ relaxor ferroelectric ceramics
Authors: Tang, Xingui
Chan, Helen L. W.
Subjects: Sol-gel processing
Ferroelectric ceramics
Grain size
Dielectric properties
Ceramic products
Issue Date: 6-Jan-2005
Publisher: American Institute of Physics
Source: Journal of applied physics, 6 Jan. 2005, v. 97, 034109, p. 1-6
Abstract: (Ba[sub 0.90]Ca[sub 0.10])(Zr[sub 0.25]Ti[sub 0.75])O₃ (BCZT) relaxor ferroelectric ceramics with grain sizes of 0.85, 2.5, 15, and 30 µm were prepared from powders synthesized using a sol-gel process. The effects of grain size and dc field on the dielectric properties and tunabilities of BCZT ceramics were investigated. As the grain size decreased, the maximum dielectric constant decreased and the transition temperature increased. The BCZT ceramics with various grain sizes showed a typical relaxor ferroelectric behavior. The dielectric relaxation rate follows the Vogel-Fulcher relation. The dielectric constant is greatly suppressed and the low loss is obtained under a dc electric field. At room temperature (300 K) and 20 kV/cm, the tunabilities and figures of merit are 42% and 62, 51% and 98, 56% and 193, and 51% and 182, respectively, for the BCZT ceramics with grain sizes of 0.85, 2.5, 15, and 30 µm.
Rights: © 2005 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in X.-G. Tang & H.L.W. Chan. J. Appl. Phys. 97, 034109 (2005) and may be found at
Type: Journal/Magazine Article
ISSN: 0021-8979
Appears in Collections:MRC Journal/Magazine Articles
AP Journal/Magazine Articles

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