Abstract
The effects of substituting Zn with Mg on the phase relation and microwave dielectric properties of Zn3Nb2O8 ceramics were investigated in this study. X-ray diffraction patterns illustrate that the (Zn1−xMgx)3Nb2O8 solid solution could be formed in the composition range of x=0–0.6, while the two phase regions with a mixture of MgNb2O6 and Mg4Nb2O9 were identified for x=0.8–1.0. A small level of Mg substitution (x=0.05) substantially improved the Q×f value of the ceramics. Either decreasing the A-site bond valence or increasing the B-site bond valence leads to a decrease in the τf value. An extremely low-loss dielectric can be achieved for specimens using (Zn0.95Mg0.05)3Nb2O8 ceramics (εr∼21.52, Q×f∼130,000GHz, τf ∼–83.8ppm/°C) after sintering at 1180°C/4h; consequently, it is proposed as a candidate material for high-frequency applications.
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