Control of microwave dielectric properties in 0.42ZnNb2O6-0.58TiO2 ceramics by the quantitative analysis of phase transition

Do Kyun Kwon, Dong Wan Kim, Kug Sun Hong

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Abstract

Phase constitutions of ZnNb2O6-TiO2 mixture ceramics were significantly changed according to the sintering temperature. Phase transition procedures and their effect on the microwave dielectric properties of 0.42ZnNb2O6-0.58TiO2 were investigated using X-ray powder diffraction and a network analyzer. The fractions of the phases composing the mixture were calculated by measuring integral intensities of each reflection. The structural transitions in 0.42ZnNb2O6-0.58TiO2 were interpreted as the association of two distinct steps: the columbite and rutile to ixiolite transition present at lower temperatures (900∼950 °C) and the ixiolite to mille transition at higher temperatures (1150∼1300 °C). These transitions caused considerable variation of microwave dielectric properties. Importantly, τf was modified to around 0 ppm/°C in two sintering conditions (at 925 °C for 2 hr and at 1300 °C for 2 hr), by the control of phase constitution.

Original languageEnglish
Pages (from-to)583-589
Number of pages7
JournalMetals and Materials International
Volume8
Issue number6
Publication statusPublished - 2002 Dec 1
Externally publishedYes

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Keywords

  • Ceramics
  • Microwave dielectric properties
  • Phase transition
  • Quantitative analysis
  • ZnNbO-TiO

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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