Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Phase Evolution, Microstructure and Microwave Dielectric Properties of Zn1.9-2xLixAlxSi1.05O4 Ceramics

  • Kim, Yun-Han (Department of Materials Engineering, Graduate School, Gangneung-Wonju National University) ;
  • Kim, Shin (Hasla Co., Ltd.) ;
  • Jeong, Seong-Min (Energy & Environmental Division, Korea Institute of Ceramic Engineering and Technology(KICET)) ;
  • Kim, So-Jung (Department of Electrical and Electronic Engineering, Hanzhong University) ;
  • Yoon, Sang-Ok (Department of Materials Engineering, Graduate School, Gangneung-Wonju National University)
  • Received : 2015.03.13
  • Accepted : 2015.05.06
  • Published : 2015.05.31
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Abstract

Phase evolution, microstructure, and microwave dielectric properties of $Li_2O$ and $Al_2O_3$ doped $Zn_{1.9}Si_{1.05}O_4$, i.e., $Zn_{1.9-2x}Li_xAl_x-Si_{1.05}O_4$, ceramics (x = 0.02 ~ 0.10) were investigated. The ceramics were densified by $SiO_2$-rich liquid phase composed of the Li-Al-Si-O system, indicating that doped Li and Al contributed to the formation of the liquid. As the secondary phase, ${\beta}$-spodumene solid solution with the composition of $LiAlSi_3O_8$ was precipitated from the liquid during the cooling process. The dense ceramics were obtained for the specimens of $$x{\geq_-}0.06$$ showing the rapid densification above $1000^{\circ}C$, implying that a certain amount of liquid is necessary to densify. The specimen of x = 0.06 sintered at $1050^{\circ}C$ exhibited good microwave dielectric properties; the dielectric constant and the quality factor ($Q{\times}f_0$) were 6.4 and 11,213 GHz, respectively.

Keywords

References

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