Influence of Mg substitutions for Zn on the phase relation and microwave dielectric properties of (Zn1−xMgx)3Nb2O8 (x = 0.02–1.0) system
Influence of Mg substitutions for Zn on the phase relation and microwave dielectric properties of (Zn1−xMgx)3Nb2O8 (x = 0.02–1.0) system
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DOI：
10.1016/j.jallcom.2013.07.032
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发表时间：
2013-12
影响因子：
6.2
通讯作者：
W. Yang;Chin-Cheng Pan;Chengxiong Huang
中科院分区：
文献类型：
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作者：
W. Yang;Chin-Cheng Pan;Chengxiong Huang
研究了Mg取代Zn对Zn 3 Nb 2 O 8陶瓷相关系和微波介电性能的影响。X射线衍射分析表明，在x = 0 ~ 0.6的范围内，可以形成（Zn 1-xMgx）3 Nb 2 O 8固溶体，而在x = 0.8 ~ 1.0的范围内，可以形成MgNb 2 O 6和Mg 4 Nb 2 O 9的两相混合物。少量的Mg取代（x= 0.05）可显著提高陶瓷的Q × f值。降低A位键价或增加B位键价都会导致τ f值的降低。（Zn 0. 95 Mg 0. 05）3 Nb 2 O 8陶瓷在1180 °C/4 h烧结后，其介电损耗极低（εr = 21. 52，Q ×f = 130，000 GHz，τf =-83. 8 ppm/°C），可作为高频应用的候选材料。
The effects of substituting Zn with Mg on the phase relation and microwave dielectric properties of Zn3Nb2O8ceramics were investigated in this study. X-ray diffraction patterns illustrate that the (Zn1−xMgx)3Nb2O8solid solution could be formed in the composition range ofx= 0–0.6, while the two phase regions with a mixture of MgNb2O6and Mg4Nb2O9were identified forx= 0.8–1.0. A small level of Mg substitution (x= 0.05) substantially improved theQ×fvalue of the ceramics. Either decreasing the A-site bond valence or increasing the B-site bond valence leads to a decrease in theτfvalue. An extremely low-loss dielectric can be achieved for specimens using (Zn0.95Mg0.05)3Nb2O8ceramics (εr∼ 21.52,Q×f∼ 130,000 GHz,τf∼ –83.8 ppm/°C) after sintering at 1180 °C/4 h; consequently, it is proposed as a candidate material for high-frequency applications.