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Abstract
The effects of the addition of glass to the microwave properties of BaO·La2O3·4.7TiO2 ceramics were investigated. Three commercial glasses: PbO–B2O3–SiO2 (GA9), ZnO–B2O3–SiO2 (GP032) and PbO–B2O3 (LS3081), were investigated in this study. The ceramics without glass addition and sintered at 1300°C gave the relative dielectric constant εr=92, quality factor Q=1653 and temperature coefficient of resonant frequency τf=40.3 ppm/°C at 3.0 GHz. With 20 wt% GA9 addition, highly dense samples (void fraction were ≤2.5 vol%) were obtained at Ts≥900°C and their microwave properties were: εr≥64, Q≥1037 and τf≤15.3 ppm/°C at 3.0 GHz. The high sintering temperature increased εr and Q values but decreased the value of τf. The densification of specimens was found to play an important role in improving the dielectric constant. Heterogeneous interfaces and the dissolution of trace amounts of ceramics in glass increased the dielectric loss significantly; also, the former increased τf whereas the latter decreased it.
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