Abstract
The effects of Pb1.5Nb2O6.5 addition were investigated on the densification, phase evolution, microstructure, and microwave dielectric properties of 5ZnO·2B2O3 ceramics. It was shown that a 5.5mol% addition of Pb1.5Nb2O6.5 to 5ZnO·2B2O3 ceramics successfully tailored its temperature coefficient of resonant frequency (τf) from −80 to ~0ppm/°C and lowered its sintering temperature from 955 to 890°C without degrading its microwave dielectric properties. 5ZnO·2B2O3 ceramics sintered at 890−910°C for 3h with 5.0−6.0mol% Pb1.5Nb2O6.5 additions exhibited excellent microwave dielectric properties: εr=7.8−8.3, Q×f=11,500−15,200GHz, and −9.2ppm/°C≤τf≤+6.6ppm/°C @ ~7.4GHz. The ceramics showed cofiring compatibility with Ag and were therefore novel candidates for LTCC substrates.
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