Microwave dielectric properties of (1 - X)(Mg0.95Zn 0.05)TiO3-xCa0.6la0.8/3TiO 3 ceramic system

Jun Jie Wang, Cheng Liang Huang, Po Hsin Li

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The microstructures and microwave dielectric properties of the (1 - x)(Mg0.95Zn0.05)TiO3-xCa0.6La 0.8/3TiO3 ceramic system were investigated. To achieve a temperature-stable material, we studied a method of combining a positive-temperature-coefficient material with a negative one. Ca 0.6La0.8/3TiO3 has the following dielectric properties: a dielectric constant of εr ∼ 109, a Q × f of ∼ 17,600 GHz and a large positive τf of ∼213 ppm/°C. (Mg0.95Zn0.05)TiO3 possesses a dielectric constant of εr ∼ 16, a high Q × f of ∼210,000 (at 9 GHz) and a negative τf of -60 ppm/°C. As x varies from 0 to 0.9, the (1 - x)(Mg0.95Zn0.05)TiO 3-xCa0.6La0.8/3TiO3 ceramic system has the following dielectric properties: 16 < εr < 88, 32,800 < Q × f < 210,000 and -60 < τf < 205. By appropriately adjusting the x value in the (1 - x)(Mg0.95Zn 0.05)TiO3-xCa0.6La0.8/3TiO 3 ceramic system, a zero τf value can be attained. With x = 0.15, a dielectric constant εr of ∼26, a Q × f value of ∼86,000 GHz (at 9 GHz) and a τf value of ∼0.5 ppm/°C were obtained for 0.85(Mg0.95Zn0.05)TiO 3-0.15Ca0.6La0.8/3TiO3 ceramics sintered at 1320°C for 4 h.

Original languageEnglish
Pages (from-to)6352-6356
Number of pages5
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Issue number8 A
Publication statusPublished - 2006 Aug 4

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physics and Astronomy(all)

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