High-dielectric-constant and low-loss microwave dielectric in the (1 - X)La(Mg0.5Ti0.5)O3-x(Ca0.8Sr 0.2)TiO3 solid solution system

Cheng Liang Huang, Jhih Yong Chen

Research output: Contribution to journalLetter

7 Citations (Scopus)

Abstract

The microwave dielectric properties and microstructures of (1 - x)La(Mg0.5Ti0.5)O3-x(Ca0.8Sr 0.2)TiO3 ceramics, prepared by a mixed oxide route, have been investigated. The forming of solid solutions was confirmed by the XRD patterns and the measured lattice parameters for all compositions. A near zero τf was achieved for samples with x = 0.5, although the dielectric properties varied with sintering temperature. The Q × f value of 0.5La(Mg0.5Ti0.5)O3-0.5(Ca0.8Sr 0.2)TiO3 increased up to 1475 °C, after which it decreased. The decrease in dielectric properties was coincident with the onset of rapid grain growth. The optimum combination of microwave dielectric properties was achieved at 1475 °C for samples where x = 0.5 with a dielectric constant εr of 47.12, a Q × f value of 35,000 GHz (measured at 6.2 GHz) and a τf value of -4.7 ppm/°C.

Original languageEnglish
Pages (from-to)L99-L102
JournalJournal of Alloys and Compounds
Volume509
Issue number6
DOIs
Publication statusPublished - 2011 Feb 10

All Science Journal Classification (ASJC) codes

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

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