Abstract
In this work, the (1−x)Li3(Mg0.92Zn0.08)2NbO6–xBa3(VO4)2 (x=0.1–0.35) ceramics were prepared via a conventional solid state reaction route. The phase composition, microstructure and microwave dielectric properties were investigated by an X-ray diffractometer (XRD), a scanning electron microscope and a network analyzer. The XRD results indicated that the Li3(Mg0.92Zn0.08)2NbO6 and Ba3(VO4)2 phases could well coexist without forming any secondary phases. The dielectric constant (ϵr) and quality factor (Q×f) values of the Li3(Mg0.92Zn0.08)2NbO6 ceramic decreased with the addition of Ba3(VO4)2 phase, however its temperature coefficient of resonant frequency (τf) value was improved significantly. Excellent microwave dielectric properties of ϵr∼16.3, Q×f∼50,084GHz (at 8.64GHz) and τf∼1.5ppm/°C were achieved for the x=0.3 sample when sintered at 950°C for 4h. The chemical compatibility with Ag electrode indicated that the 0.7Li3(Mg0.92Zn0.08)2NbO6–0.3Ba3(VO4)2 composite ceramic would be a promising material for the low temperature cofired ceramic applications.
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