Microwave dielectric properties of Mg4Nb2O9/CaTiO3 composite ceramics
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摘要: 采用传统固相法制备Mg4Nb2O9/CaTiO3复合陶瓷, 研究Li2CO3-V2O5(LV) 共掺杂对其烧结特性、 微观结构和微波介电性能的影响。实验结果表明: 一定量的LV掺杂能够使Mg4Nb2O9/CaTiO3复合陶瓷的烧结 温度降至1200℃; XRD和EDX综合分析表明, 样品由(Mg4-xCax)Nb2O9/(Ca1-xMgx)TiO3两相所组成; 陶瓷谐振频率温度系数趋近于零。含质量分数1.5%的LV, 1200℃、5h烧结样品具有较好的微波介电性能: 介电常数23.29, 品质因数23460GHz, 谐振频率温度系数1.0×10-6℃-1, 有望用作全球卫星定位系统微带天线基板材料。
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关键词:
- 复合陶瓷 /
- 介电性能 /
- Li2CO3-V2O5添加 /
- X射线衍射 /
- 烧结
Abstract: The Mg4Nb2O9-CaTiO3 composite ceramics were synthesised by the conventional solid-state reaction. The effects of Li2CO3-V2O5 (LV) addition on the sintering behavior, microstructure and microwave dielectric properties of Mg4Nb2O9/CaTiO3 ceramics were investigated. It is found that an amount LV co-doped can effectively low the desification sintering temperature to 1200℃ of Mg4Nb2O9/CaTiO3 ceramics. Two-phase system was confirmed by the XRD and EDX spectrum analysis. A near zero temperature coefficient of resonant frequency was obtained. Inparticular, a new Mg4Nb2O9-CaTiO3 ceramics with 1.5% mass fraction of LV doped sintered at 1200℃ for 5h exhibited excellent microwave dieletric properties of ε=23.29, Qf=23460GHz and τf=1.0×10-6℃-1. It is proposed as a candidate subatrate material for GPS microstrip antenna.-
Keywords:
- composite ceramics /
- dielectric properties /
- Li2CO3-V2O5 additives /
- XRD /
- sintering
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