Abstract
The sintering temperature of the LiAlSiO4(LAS) ceramics, which exhibited the microwave dielectric properties of εr = 4.8, Q × f = 36 000GHz, and τf=8.0 ppm/°C, decreased below 960°C when B2O3 was added. The B2O3‐related liquid phase was formed and assisted the densification of the LAS ceramics at low temperatures. The average grain size of the specimen sintered at 950°C increased with the addition of B2O3 but decreased when B2O3 exceeded 12.0 mol%, probably due to the presence of a large amount of liquid phase. The LAS ceramics containing 12.0 mol% of B2O3 sintered at 950°C exhibited the excellent microwave dielectric properties of εr = 5.3, Q×f = 212 000GHz and τf =‐7.7 ppm/°C.
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