Abstract
K2O–B2O3–SiO2 (KBS) synthesized via a solid-state reaction process was chosen as a novel sintering aid for Ba6–3x(Sm1-y, Ndy)8+2xTi18O54 + 2TiO2 (x = 2/3 and y = 0.5; BSNTT) ceramics. Effects of KBS doping on sintering behavior, microstructure and microwave dielectric properties of BSNTT ceramic were investigated. The appropriate KBS addition significantly lowered the sintering temperature of BSNTT ceramic with slightly damaging its microwave dielectric properties. The X-ray diffraction results showed that all the well sintered samples exhibited the main phase Ba(Sm,Nd)2Ti4O12 and a certain amount of Ba2Ti9O20 and TiO2 secondary phases. Besides, the other secondary phase Sm2Ti2O7 formed when 9 wt% KBS added. Then the scanning electron microscopy micrographs of the optimally well-sintered (1075 °C for 3 h) ceramics showed a dense microstructure. With the increasing content of KBS addition, both the dielectric constant (er) and quality factor (Q × f) value decreased. At last, the good microwave dielectric properties of er = 68.8, Q × f = 6766 GHz, τf = 28.76 ppm/°C were obtained for BSNTT + 5 wt% KBS ceramic sintered in air at 1075 °C for 3 h.
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