The effect of glass additives on the microwave dielectric properties of Ba(Mg1/3Ta2/3)O3 ceramics |
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Authors: | KP Surendran MT Sebastian |
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Institution: | a Ceramic Technology Division, Regional Research Laboratory, Industrial Estate, Papanamcode, Trivandrum, Kerala 695 019, India b Department of Electronics, Cochin University of Science and Technology, Cochin 682 022, India |
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Abstract: | The effect of glass additives on the densification, phase evolution, microstructure and microwave dielectric properties of Ba(Mg1/3Ta2/3)O3 (BMT) was investigated. Different weight percentages of quenched glass such as B2O3, SiO2, B2O3-SiO2, ZnO-B2O3, 5ZnO-2B2O3, Al2O3-SiO2, Na2O-2B2O3·10H2O, BaO-B2O3-SiO2, MgO-B2O3-SiO2, PbO-B2O3-SiO2, ZnO-B2O3-SiO2 and 2MgO-Al2O3-5SiO2 were added to calcined BMT precursor. The sintering temperature of the glass-added BMT samples were lowered down to 1300 °C compared to solid-state sintering where the temperature was 1650 °C. The formation of high temperature satellite phases such as Ba5Ta4O15 and Ba7Ta6O22 were found to be suppressed by the glass addition. Addition of glass systems such as B2O3, ZnO-B2O3, 5ZnO-2B2O3 and ZnO-B2O3-SiO2 improved the densification and microwave dielectric properties. Other glasses were found to react with BMT to form low-Q phases which prevented densification. The microwave dielectric properties of undoped BMT with a densification of 93.1% of the theoretical density were εr=24.8, and Qu×f=80,000 . The BMT doped with 1.0 wt% of B2O3 has Qu×f=124,700 , εr=24.2, and . The unloaded Q factor of 0.2 wt% ZnO-B2O3-doped BMT was 136,500 GHz while that of 1.0 wt% of 5ZnO-2B2O3 added ceramic was Qu×f=141,800 GHz. The best microwave quality factor was observed for ZnO-B2O3-SiO2 (ZBS) glass-added ceramics which can act as a perfect liquid-phase medium for the sintering of BMT. The microwave dielectric properties of 0.2 wt% ZBS-added BMT dielectric was Qu×f=152,800 GHz, εr=25.5, and . |
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Keywords: | Dielectric resonator Microwave dielectric Complex perovskite Barium magnesium tantalate Dielectric properties Liquid-phase sintering Glass addition Cation ordering Low-loss materials Low-temperature co-fired ceramics |
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