TITLE

Dielectric tunability of (Ba0.90Ca0.10)(Ti0.75Zr0.25)O3 ceramics

AUTHOR(S)
Tang, X. G.; Chew, K.-H.; Wang, J.; Chen, H. L. W.
PUB. DATE
August 2004
SOURCE
Applied Physics Letters;8/9/2004, Vol. 85 Issue 6, p991
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We have performed a study on the dielectric properties of (Ba0.90Ca0.10)(Ti0.75Zr0.25)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≈Tm (Tm is the temperature of dielectric maximum) and the field-induced variation of dielectric constant Δε is nonzero for T-Tm<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.
ACCESSION #
14019768

 

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