Abstract
SnO2-doped Li2MgTi3O8 ceramics were successfully synthesized by a solid-state method. The effects of SnO2 addition on the microstructure and dielectric properties of Li2Mg(Ti1−xSnx)3O8 (x=0.10–0.25)were investigated. Microscopic analysis showed that two phase composition regions were identified in the specimens sintered at 1100°C; [spinel+rutile] at 0.10≤×≤0.15, and [spinel+rutile+ilmenite] at 0.20≤×≤0.25. As SnO2 concentration increased, the temperature coefficient of resonant frequency(τƒ) and dielectric constant(εr) decreased, which was strongly correlated with the phase composition. However, the quality factor (Q׃) significantly increased with SnO2 content due to the increase of grain size. Especially, the Li2Mg(Ti1−xSnx)3O8 (x=0.15) ceramics sintered at 1100°C for 4h exhibited good microwave dielectric properties: εr=26.0, Q׃=74,700GHz and τƒ =−5.2ppm/°C.
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