Abstract
SiO2 nanoparticles (SiO2 NPs) modified 0.02B2O3–0.98SiO2 ceramics were prepared by solid state sintering. The microstructure and microwave dielectric properties were investigated. All the modified samples exhibited low-cristobalite phase with small amount of quartz. The quartz phase inhibited the cracking caused by crystallization process of low-cristobalite. The densification of 0.02B2O3–0.98SiO2 ceramics improved with SiO2 NPs addition. The introduction of 1.5 wt% SiO2 NPs brings excellent microwave dielectric properties with er = 4.4, Q × f = 42000 GHz, τf = − 5 ppm/°C for the samples sintered at 1250 °C, which can be a low-temperature sintering system as microwave substrate materials.
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