Dielectric properties of a new ceramic system (1 - x)Mg4Nb2O9-xCaTiO3 at microwave frequency

Cheng Liang Huang, Jhih Yong Chen, Chih Chao Liang

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16 Citations (Scopus)

Abstract

The microstructures and the microwave dielectric properties of the (1 - x)Mg4Nb2O9-xCaTiO3 ceramic system were investigated. In order to achieve a temperature-stable material, CaTiO3f ∼ 800 ppm/°C) was chosen as a τf compensator and added to Mg4Nb2O9f ∼ -70 ppm/°C) to form a two phase system. It was confirmed by the XRD and EDX analysis. By appropriately adjusting the x-value in the (1 - x)Mg4Nb2O9-xCaTiO3 ceramic system, near-zero τf value can be achieved. A new microwave dielectric material, 0.5Mg4Nb2O9-0.5CaTiO3 applicable in microwave devices is suggested and possesses the dielectric properties of a dielectric constant εr ∼ 24.8, a Q × f value ∼82,000 GHz (measured at 9.1 GHz) and a τf value ∼-0.3 ppm/°C.

Original languageEnglish
Pages (from-to)1111-1115
Number of pages5
JournalMaterials Research Bulletin
Volume44
Issue number5
DOIs
Publication statusPublished - 2009 May 6

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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