Microwave dielectric properties of (1 - x)(Mg0.95Co0.05)TiO3- xCa0.6La0.8/3TiO3 ceramics with V2O5 addition

Cheng Liang Huang, Jun Jie Wang

研究成果: Article同行評審

3 引文 斯高帕斯(Scopus)


The microstructures and the microwave dielectric properties of the (1 - x)(Mg0.95Co0.05)TiO3-xCa0.6La0.8/3TiO3 ceramic system were investigated. In order to achieve a temperature-stable material, we studied a method of combining a positive temperature coefficient material with a negative one. Ca0.6La0.8/3TiO3 has dielectric properties of dielectric constant εr ∼ 109, Q × f value ∼ 17,600 GHz and a large positive τf value ∼ 213 ppm/°C. (Mg0.95Co0.05)TiO3 ceramics possesses high dielectric constant (εr ∼ 16.8), high quality factor (Q × f value ∼ 230,000 GHz), and negative τf value (-54 ppm/°C). As the x value varies from 0.1 to 0.8, (1 - x)(Mg0.95Co0.05)TiO3-xCa0.6La0.8/3TiO3 ceramic system has the dielectric properties as follows: 21.55 < εr < 75.44, 21,000 < Q × f < 90,000 and -10 < τf < 140. By appropriately adjusting the x value in the (1 - x)(Mg0.95Co0.05)TiO3-xCa0.6La0.8/3TiO3 ceramic system, zero τf value can be achieved. With x = 0.15, a dielectric constant εr ∼ 25.78, a Q × f value ∼ 84,000 GHz (at 9 GHz), and a τf value ∼ 2 ppm/°C were obtained for 0.85(Mg0.95Co0.05)TiO3-0.15Ca0.6La0.8/3TiO3 ceramics sintered at 1400 °C for 4 h. For practical application in communication systems, it is desirable to be able to sinter at lower temperatures. Therefore, V2O5 was as a sintering aid for lowering the sintering temperature of0.85(Mg0.95Co0.05)TiO3-0.15Ca0.6La0.8/3TiO3 ceramics. At the same time, the 0.85(Mg0.95Co0.05)TiO3-0.15Ca0.6La0.8/3TiO3 ceramic system with 0.5 wt% V2O5 can be obtained good properties at the microwave frequencies for 1200 °C.

頁(從 - 到)1349-1354
期刊Solid-State Electronics
出版狀態Published - 2006 7月

All Science Journal Classification (ASJC) codes

  • 電子、光磁材料
  • 凝聚態物理學
  • 電氣與電子工程
  • 材料化學


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