Effect of B2O3 and CuO additives on the sintering temperature and microwave dielectric properties of Ba(Mg1/3Nb2/3)O3 ceramics

Jong Bong Lim, Dong Hyun Kim, Sahn Nahm, Jong Hoo Paik, Hwack Joo Lee

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

B2O3 added Ba(Mg1/3Nb2/3)O3 (BBMN) ceramics cannot be sintered below 930 °C. However, when CuO was added to them, they were sintered even at 850 °C. The amount of the Ba2B2O5 second phase, which was formed in the BBMN ceramics decreased with the addition of CuO. Therefore, the CuO additive is considered to react with the B2O3 inhibiting the reaction between B2O3 and BaO. A dense microstructure without pores developed with the addition of a small amount of CuO. The bulk density, dielectric constant (εr) and Q-value increased with the addition of CuO, but decreased when a large amount of CuO was added. Excellent microwave dielectric properties were obtained for the Ba(Mg1/3Nb2/3)O3 + 2.0 mol% B2O3 + 10.0 mol% CuO ceramic sintered at 875 °C for 2 h, with values Qxf = 21 500 GHz, εr = 31 and temperature coefficient of resonance frequency (τf) = 21.3 ppm/°C.

Original languageEnglish
Pages (from-to)1199-1205
Number of pages7
JournalMaterials Research Bulletin
Volume41
Issue number6
DOIs
Publication statusPublished - 2006 Jun 15

Keywords

  • A. Ceramics
  • A. Electronic materials
  • C. Electron microscopy
  • D. Dielectric properties
  • D. Microstructure

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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