Improved Figure of Merit of (Ba,Sr)TiO3-Based Ceramics by Sn Substitution
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概要
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The dielectric properties of (Ba0.6Sr0.4)(Ti1-xSnx)O3 ($0 \leq x \leq 0.3$) ceramics were investigated. Single-phase specimens having a cubic perovskite structure could be obtained. As Sn concentration increased, dielectric loss decreased untill a composition of $x = 0.15$ and slightly increased as Sn concentration increased further. The diffused phase transition appeared owing to substitution of Sn ions. When Sn was substituted at 0.1 mol in (Ba0.6Sr0.4)TiO3 at 1400 °C, the dielectric constant, dielectric loss, tunability, Curie point, and figure of merit (FOM) were 1400, 0.0027, 18%, $-40$ °C, and 67, respectively. These compositions show excellent dielectric properties than those of (Ba0.5Sr0.5)TiO3 ferroelectrics, which are limelight materials for tunable devices such as varactors, phase shifters, and frequency agile filters.
- 2009-01-25
著者
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Yoon Seok-jin
Thin Film Material Research Center Korea Institute Of Science And Technology
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Choi Ji-won
Thin Film Material Research Center Korea Institute Of Science And Technology
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JEONG Dae-Yong
Department of Materials Science & Engineering, Myongji University
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Jeong Dae-Yong
Department of Materials Science and Engineering, Myongji University, Yongin, Gyeonggi-do 449-728, Korea
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Ha Jong-Yoon
Mechanical Department, University of California at Berkeley, Berkeley, CA 94720, U.S.A.
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Lin Liwei
Mechanical Department, University of California at Berkeley, Berkeley, CA 94720, U.S.A.
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