Dielectric tunability of (Ba0.90Ca0.10)(Ti0.75Zr0.25)O-3 ceramics

Chew, K.H. and Chan, H.L.W. and Tang, X.G. and Wang, J. (2004) Dielectric tunability of (Ba0.90Ca0.10)(Ti0.75Zr0.25)O-3 ceramics. Applied Physics Letters, 85 (6). pp. 991-993. ISSN 0003-6951

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Abstract

We have performed a study on the dielectric properties of (Ba0.90Ca0.10)(Ti0.75Zr0.25)O-3 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 Tapproximate toT(m) (T-m is the temperature of dielectric maximum) and the field-induced variation of dielectric constant Deltaepsilon is nonzero for T-T-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 (approximate to0.003), and large figure of merit (200), clearly indicate that these ceramics are suitable candidates for microwave applications. (C) 2004 American Institute of Physics.

Item Type: Article
Additional Information: Department of Physics, Faculty of Science Building, University of Malaya, 50603 Kuala Lumpur, MALAYSIA
Uncontrolled Keywords: Thin-films, Behavior, Temperature, Devices
Subjects: Q Science > QC Physics
Divisions: Faculty of Science > Dept of Physics
Depositing User: Miss Malisa Diana
Date Deposited: 02 Aug 2013 01:34
Last Modified: 27 Feb 2015 01:14
URI: http://eprints.um.edu.my/id/eprint/8212

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