| 세라믹스 종결정 위에 Floating Zone Technique 법으로 성장한 Ba(Ti0.92Zr0.08)O3 다결정의 Tunability |
| 황호병 |
| 대전대학교 전자재료과학과 |
| Tunability of Ba(Ti0.92Zr0.08)O3 Polycrystal Grown on Ceramic Seed by Floating Bone Technique |
| Ho-Byong Hwang |
| Department of Electronic Materials Science, Daejeon University |
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| ABSTRACT |
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[ $Ba(Zr_{0.08}Ti_{0.92})O_3$ ] polycrystal was grown by floating zone technique with two ellipsoidal mirrors using the $8%$of Zr-modified BZT ceramics as both a feed rod and a seed crystal. In order to study the annealing effect, a part of the grown crystal was sliced and annealed in the oxygen atmosphere at $1,200^{circ}C$ for 10 h. The dielectric constant and loss at 10 kHz, 100 kHz, and 1 MHz were measured in the temperature range between $-100^{circ}C$ and $150^{circ}C$ to investigate the dielectric properties of the grown polycrystal. The electric-field dependence of the dielectric constant at 10 kHz and 100 kHz was studied by measuring the dielectric constants as a function of the biased-electric fields which ran from -15 kV/cm to 15 kV/cm. Due to the effect of annealing in the oxygen atmosphere, the electric-field tunability of dielectric constants increased from $47.5%$ to 5 to and the figure of merit for this material from 39.6 to 46.4. Since the figure of merit can be increased to more than 46.4 by increasing the maximum value of the biased-electric fields to more than 15 V/cm, this material nay have a possibility for applications in microwave tuning devices at room temperature. |
| Key words:
Floating tone technique, polycrystal, Dielectric properties, Electric-field dependence, Tunability |
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