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http://dx.doi.org/10.4191/kcers.2015.52.3.215

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)
Publication Information
Journal of the Korean Ceramic Society / v.52, no.3, 2015 , pp. 215-220 More about this Journal
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
$Zn_2SiO_4$; Liquid-phase sintering; $LiAlSi_3O_8$; Dielectric constant; Quality factor;
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