Effect of B 2O 3-Bi 2O 3-SiO 2-ZnO glass on the sintering and microwave dielectric properties of 0.83ZnAl 2O 4-0.17TiO 2

Abstract

The 0.83ZnAl 2O 4-0.17TiO 2 (ZAT) ceramics were synthesized by solid state ceramic route. The effect of 27B 2O 3-35Bi 2O 3-6SiO 2-32ZnO (BBSZ) glass on the microwave dielectric properties of ZAT was investigated. The crystal structure and the microstructure of the ceramic-glass composites were studied by X-ray diffraction and scanning electron microscopic techniques. The low frequency dielectric loss was measured at 1 MHz. The dielectric properties of the sintered samples were measured in the microwave frequency range by the resonance method. Addition of 0.2 wt% of BBSZ improved the dielectric properties with quality factor ( Q u × f) > 120,000 GHz, temperature coefficient of resonant frequency ( τ f) = −7.3 ppm/°C and dielectric constant ( ɛ r) = 11.7. Addition of 10 wt% of BBSZ lowered the sintering temperature to about 950 °C with Q u × f > 10,000 GHz, ɛ r = 10 and τ f = −23 ppm/°C. The reactivity of 10 wt% BBSZ added ZAT with silver was also studied. The results show that ZAT doped with suitable amount of BBSZ glass is a possible material for low-temperature co-fired ceramic (LTCC) application.