Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/399
Title: Dielectric tunability of (Ba[sub 0.90]Ca[sub 0.10])(Ti[sub 0.75]Zr[sub 0.25])O₃ ceramics
Authors: Tang, X
Chew, K
Wang, J
Chan, HLW 
Issue Date: 9-Aug-2004
Source: Applied physics letters, 9 Aug. 2004, v. 85, no. 6, p. 991-993
Abstract: We have performed a study on the dielectric properties of (Ba[sub 0.90]Ca[sub 0.10])(Ti[sub 0.75]Zr[sub 0.25])O₃ bulk ceramics prepared by a sol-gel technique in the cooling temperature range from 400 to 213 K. The ceramics are found to exhibit an interesting dielectric response under the presence of a dc bias field. The field dependence of dielectric constant is stronger at T≈T[sub m] (T[sub m] is the temperature of dielectric maximum) and the field-induced variation of dielectric constant Δε is nonzero for T-T[sub m]<150 K. One striking feature of these ceramics is that they possess a broad optimum value of figure of merit (as high as 200 at 30 kV/cm) between the temperature range from 295 and 330 K. At room temperature, the high tunability (K=60%), low-loss tangent (≈0.003), and large figure of merit (200), clearly indicate that these ceramics are suitable candidates for microwave applications.
Keywords: Barium compounds
Calcium compounds
Dielectric materials
Ceramics
Sol-gel processing
Permittivity
Dielectric losses
Publisher: American Institute of Physics
Journal: Applied physics letters 
ISSN: 0003-6951
EISSN: 1077-3118
DOI: 10.1063/1.1781734
Rights: © 2004 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 et al.Appl. Phys. Lett. 85, 991 (2004) and may be found at http://link.aip.org/link/?apl/85/991
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