Low-loss microwave dielectrics in the Mg2(Ti 0.95Sn0.05)O4-(Ca0.8Sr 0.2)TiO3 ceramic system

Jhih Yong Chen, Chang Yang Jiang, Cheng-Liang Huang

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3 Citations (Scopus)

Abstract

The microwave dielectric properties of the (1 - x)Mg2(Ti 0.95Sn0.05)O4-x(Ca0.8Sr 0.2)TiO3 ceramic system prepared by mixed oxide route have been investigated. The crystal structures and the microstructures of the ceramics were characterized by means of X-ray and SEM. The microwave dielectric properties are strongly related to the density and matrix of the specimen. Combination of Mg2(Ti0.95Sn0.05)O4 (spinel-structured) and (Ca0.8Sr0.2)TiO3 (perovskite-structured) forms a two-phase system and leads to a near-zero τf. With increasing x, the microwave Q × f decreased and εr increased. A new microwave dielectric material 0.91Mg 2(Ti0.95Sn0.05)O4-0.09(Ca 0.8Sr0.2)TiO3, possessing excellent microwave dielectric properties with a dielectric constant (εr) of 18.32, a Q × f of 109,200 GHz (where f = 9.5 GHz, is the resonant frequency) and a τf value ∼-0.5 ppm/°C at 1270 °C for 4 h, is proposed as a suitable candidate material for microwave applications requiring low dielectric loss.

Original languageEnglish
Pages (from-to)324-328
Number of pages5
JournalJournal of Alloys and Compounds
Volume502
Issue number2
DOIs
Publication statusPublished - 2010 Jul 23

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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