Mg4Nb2O9/CaTiO3复合陶瓷的微波介电性能

姚国光; 刘鹏

Mg₄Nb₂O₉/CaTiO₃复合陶瓷的微波介电性能

姚国光^1,,
刘鹏²

1.
西安邮电学院理学院, 西安710121;
2.
陕西师范大学物理与信息技术学院, 西安 710062

基金项目: 陕西省自然科学基金(2009JM6001); 陕西省教育厅项目(09JK729)

详细信息

通讯作者:
姚国光, 讲师, 主要从事微波介质材料的研究 E-mail: yaoguoguang@xupt.edu.cn

中图分类号: TQ174
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出版历程
- 收稿日期: 2010-02-04
- 修回日期: 2010-06-19
- 刊出日期: 2011-02-14

Microwave dielectric properties of Mg₄Nb₂O₉/CaTiO₃ composite ceramics

YAO Guoguang^1,,
LIU Peng²

1.
School of Science, Xi’an University of Post and Telecommunications, Xi’an 710121, China;
2.
College of Physics and Information Technology, Shaanxi Normal University, Xi’an 710062, China

摘要

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(Mg_4-xCa_x)Nb₂O₉/(Ca_1-xMg_x)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℃、5h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23460GHz, 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。
- 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 5h exhibited excellent microwave dieletric properties of ε=23.29, Qf=23460GHz and τ_f=1.0×10^-6℃^-1. It is proposed as a candidate subatrate material for GPS microstrip antenna.
- composite ceramics /
- dielectric properties /
- Li₂CO₃-V₂O₅ additives /
- XRD /
- sintering