Abstract
Structure, sintering behavior and microwave dielectric properties of ceramics have been investigated by x-ray powder diffraction (XRD) and scanning electron microscopy (SEM) in this paper. The microwave dielectric properties of the ceramics were studied with a network analyzer at the frequency of about 6–11GHz. The sintering temperature and microwave dielectric properties could be successfully tuned in a wide window simultaneously by adjusting the A–O bond characteristics. The sintering temperature of CaWO4 was successfully reduced from 1100°C to about 950°C by BiVO4 addition. Approximately 95%–96% theoretical density could be obtained after sintering at 950°C for 2h. All samples exhibit single Scheelite structure (I41/a) phase. The dielectric constant increased, whereas the Q×f value decreased, with the increase of x. The τf value changed from negative to positive with the increases of x. Combined excellent microwave dielectric properties with εr=22. 1, Q×f=16,730GHz and τf=2.39ppm/°C could be obtained after sintered at the 950°C for 2h for x=0.3 compositions.
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