Dielectric properties and crystal structure of (1-y) (Mg0.95 Ni0.05)4Ta2O9-y(Ca0.8Sr0.2)TiO3 ceramics

Bing Jing Li, Sih Yin Wang, Cong Zhi Su, Yuan Bin Chen

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Abstract

The microwave dielectric properties and microstructures of (1-y)(Mg0.95Ni0.05)4Ta2O9-y (Ca0.8Sr0.2)TiO3 ceramics prepared using a mixed oxide route were investigated. (Mg0.95Ni0.05)4Ta2O9 has a dielectric constant (εr) of ∼12.23, a high quality factor (Qxf ) of ∼442,092 GHz, and a temperature coefficient of resonant frequency (τf) of ∼-55 ppm/°C. To produce a temperature-stable material, Ca0.8Sr0.2TiO3, which has a large positive τf value of 990ppm/°C, was added to (Mg0.95Ni0.05)4Ta2O9. The temperature coefficient of resonant frequency increased with increasing Ca0.8Sr0.2TiO3 content, going through nearly zero at y = 0.7. The microwave dielectric material 0.3(Mg0.95Ni0.05)4Ta2O9-0.7(Ca0.8Sr0.2)TiO3 has an excellent combination of microwave dielectric properties: εr ∼29.8, Qxf ∼ 226,000GHz (at 9 GHz), and τf ∼-2.38ppm/°C sinter at 1350° C. It is proposed as a candidate material for industrial, scienti fic and medical band components and Global Position System antennas.

Original languageEnglish
Pages (from-to)1000-1003
Number of pages4
JournalJournal of the Ceramic Society of Japan
Volume122
Issue number1432
DOIs
Publication statusPublished - 2014

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • General Chemistry
  • Condensed Matter Physics
  • Materials Chemistry

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