Microwave dielectric properties of (1-x)Ba5Nb4O15-xBaNb2O6 mixtures

Dong-Wan Kim, Hyuk Joon Youn, Kug Sun Hong, Chang Kyung Kim

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

The mixture behavior and microwave dielectric properties of (1 - x)Ba5Nb4O15-xBaNb2O6 ceramics were studied by means of X-ray powder diffraction and a network analyzer. 0.17Ba5Nb4O15-0.83BaNb2O6 samples sintered at 1250°C for 2 h, exhibit excellent microwave dielectric properties: dielectric constant (εr) = 35.2, quality factor (Q × f) = 59300 GHz, and temperature coefficient of resonant frequency (τf) = 0 ppm/°C. The εr and τf of mixtures could be predicted by the appropriate mixing relation, but deviated slightly from calculated values. This was attributed to dissimilar microstructural grain morphologies of the Ba5Nb4O15 and BaNb2O6 end members. In the mixtures, higher Q × f was obtained rather than Ba5Nb4O15 and BaNb2O6, due to pore reduction. Also, the mixture behavior of low-fired Ba5Nb4O15-BaNb2O6 was discussed. A major contributor to microwave dielectric properties of low-fired samples is the low temperature phase, hexagonal BaNb2O6.

Original languageEnglish
Pages (from-to)3812-3816
Number of pages5
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume41
Issue number6 A
Publication statusPublished - 2002 Jun 1
Externally publishedYes

Keywords

  • BaNbO
  • BaNb O
  • Low-fired
  • Microwave dielectric properties
  • Mixture

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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