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Abstract
The effects of BaWO4 and MnWO4 on the microwave dielectric properties for (Zr0.8Sn0.2)TiO4 ceramics have been investigated as a function of additives concentrations (0–5 mol%). As the amount of BaWO4 and MnWO4 increase up to 1 mol%, the unloaded Q increases due to reduction of the oxygen vacancy concentration. Further addition of BaWO4 or MnWO4 causes the unloaded Q to decrease due to the presence of secondary phases, either BaWO4 itself or a needle shaped undetermined MnWO4 phase. The temperature coefficient of resonant frequency can be controlled by the volume mixing rule for (Zr0.8Sn0.2)TiO4 and secondary phases.