| ZrO2와 NiO가 첨가된 Ba(Zn1/3Ta2/3)O3에서 표면 미세조직이 고주파 유전특성에 미치는 영향 |
| 강성우, 김태희1, 문주호2, 김성열3, 박준영, 최선희, 김주선 |
한국과학기술연구원 에너지재료연구단
1안동대학교 신소재공학부 청정소재기술연구센터
2연세대학교 신소재공학부
3익스팬테크(주) |
| Effects of Surface Microstructure on Microwave Dielectric Properties of ZrO2-NiO added Ba(Zn1/3Ta2/3)O3 Ceramics |
| Sung-Woo Kang, Tae-Heui Kim1, Joo-Ho Moon2, Sung-Youl Kim3, Jun-Young Park, Sun-Hee Choi, Joo-Sun Kim |
Center for Energy Materials Research, Korea Institute of Science and Technology
1The Center of Green Materials Technology, School of Advanced Materials Engineering, Andong National University
2School of Advanced Materials Science and Engineering, Yonsei University
3Expantech
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| ABSTRACT |
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High frequency dielectric ceramics have potential for applications in mobile and satellite communications systems at frequencies higher than 10GHz. The Ba$(Zn_{1/3}Ta_{2/3})O_3$ ceramics are known to have a high quality factor, a small temperature coefficient of the resonance frequency and a high dielectric constant. On the other hands, sintering at high temperature for extended time is required to obtain the ordered structure for high quality factor. In this study, the microwave dielectric properties of $ZrO_2$ and NiO-added Ba$(Zn_{1/3}Ta_{2/3})O_3$ ceramics prepared by solid-state reaction have been investigated. Adding $ZrO_2$ and NiO could effectively promote the densification even the case of decreasing the sintering time. At the surface of samples, secondary phase of Ba-Ta compounds was formed possibly due to the evaporation of ZnO, however, the interior of the samples remained as pure Ba$(Zn_{1/3}Ta_{2/3})O_3$. The samples sintered at $1600^{circ}C$ for 2h exhibited 1:2 ordering of Zn and Ta cations. Excellent microwave dielectric properties of $Q{cdot}f$(>96,000 GHz) and ${varepsilon}_r$=30 has been obtained. |
| Key words:
Ba$(Zn_{1/3}Ta_{2/3})O_3$, Microwave dielectrics, Order-disorder, Second phase, $ZrO_2$-NiO |
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