Effects of Zr substitution on microstructure and microwave dielectric properties of Zn(Ti1−xZrx)Nb2O8 ceramics
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Zn(Ti1−xZrx)Nb2O8(x = 0, 0.2, 0.4, 0.5, 0.6) ceramics were prepared by conventional solid-state reaction process. The effects of Zr substitution for Ti on the phase composition, microstructure, and the microwave dielectric properties of Zn(Ti1−xZrx)Nb2O8 ceramics were investigated by using X-ray diffraction and scanning electron microscopy. The phase transition from ZnTiNb2O8 to ZnZrNb2O8 occurred at x = 0.5. The grain size decreased and the distribution of grain size was more homogeneous with increasing x. While εr and τf decreased slightly, a great improvement in Q × f value was obtained by the promoted densification and the uniform grains. The best combination of microwave dielectric characteristics was obtained for the composition of x = 0.4 and sintered at 1120 °C for 6 h: dielectric constant εr was 33.43, quality factor Q × f reaches 59,475 GHz, and the temperature coefficient of the resonant frequency τf was − 76.54 × 10−6/°C.
This work is supported by the National Natural Science Foundation (no. 61671224) and Jiangxi Provincial Natural Science Foundation of China (no. 20171BAB216008).
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