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Phase evolution, microstructure, and microwave dielectric properties of Li₂O and Al₂O3 doped Zn 1.9 Si 1.05 O₄, i.e., Zn 1.9-2x LixAlx-Si 1.05 O₄, ceramics (x = 0.02 ~ 0.10) were investigated. The ceramics were densified by SiO₂-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, β-spodumene solid solution with the composition of LiAlSi₃O 8 was precipitated from the liquid during the cooling process. The dense ceramics were obtained for the specimens of x 0.06 showing the rapid densification above 1000℃, implying that a certain amount of liquid is necessary to densify. The specimen of x ? 0.06 sintered at 1050℃ exhibited good microwave dielectric properties; the dielectric constant and the quality factor (Q × f 0 ) were 6.4 and 11,213 GHz, respectively.

han-guk seramik hakoeji/han'gug se'la'mig haghoeji

Phase Evolution, Microstructure and Microwave Dielectric Properties of Zn&lt;sub&gt;1.9-2x&lt;/sub&gt;Li&lt;sub&gt;x&lt;/sub&gt;Al&lt;sub&gt;x&lt;/sub&gt;Si&lt;sub&gt;1.05&lt;/sub&gt;O&lt;sub&gt;4&lt;/sub&gt; Ceramics