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

X.G. Tang, Khian-Hooi Chew, J. Wang, H.L.W. Chan

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    45 Citations (Scopus)


    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.
    Original languageEnglish
    Pages (from-to)991-993
    JournalApplied Physics Letters
    Issue number6
    Publication statusPublished - 2004


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