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 (1-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 Mg 4Nb2O9 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 sf value. An extremely low-loss dielectric can be achieved for specimens using (Zn0.95Mg0.05) 3Nb2O8 ceramics (er ∼ 21.52, Q × f ∼ 130,000 GHz, sf ∼ -83.8 ppm/°C) after sintering at 1180 °C/4 h; consequently, it is proposed as a candidate material for high-frequency applications.
All Science Journal Classification (ASJC) codes
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys
- Materials Chemistry