The effect of non-stoichiometry on the microstructure and microwave dielectric properties of the Mg1+δTiO3+δ ceramics

Cheng Liang Huang, Shih Sheng Liu, Shih Hsuan Chen

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11 Citations (Scopus)

Abstract

The microwave dielectric properties and microstructure of Mg 1+δTiO3+δ (-0.05 ≤ δ ≤ 0.05) ceramics prepared via the conventional solid-state route were investigated. A slight deviation from stoichiometry does not practically affect the relative permittivity and temperature coefficient of resonant frequency of the specimen. However, the Q × f value is very sensitive to the composition and it shows a non-linear variation corresponding to a relative amount of Mg. A very high Q × f can be achieved for specimen with single MgTiO3 phase, which can be obtained within the compositional range -0.02 ≤ δ ≤ 0.02. In addition, a low Q × f measured for specimens at δ < -0.02 can be attributed to the presence of second phase MgTi2O 5. An extremely high Q × f of ∼357,600 GHz (at 10 GHz) together with an εr of ∼18.3 and a τf of ∼-50 ppm/°C can be found for specimen using Mg1.02TiO 3.02.

Original languageEnglish
Pages (from-to)9702-9707
Number of pages6
JournalJournal of Alloys and Compounds
Volume509
Issue number40
DOIs
Publication statusPublished - 2011 Oct 6

All Science Journal Classification (ASJC) codes

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

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