Effect of B2O3 and CuO additives on the sintering temperature and microwave dielectric properties of Ba(Zn1/3 Nb2/3)O3 ceramics

Min Han Kim, Young Hun Jeong, Sahn Nahm, Hyo Tae Kim, Hwack Joo Lee

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85 Citations (Scopus)

Abstract

The B2O3 added Ba(Zn1/3Nb2/3) O3 (BBZN) ceramic was sintered at 900 °C. BaB4 O7, BaB2O4, and BaNb2 O6 second phases were found in the BBZN ceramic. Since BaB4O7 and BaB2O4 second phases have an eutectic temperature around 900 °C, they might exist as the liquid phase during sintering at 900 °C and assist the densification of the BZN ceramics. Microwave dielectric properties of dielectric constant (εr) = 32, Q × f = 3500 GHz, and temperature coefficient of resonance frequency (τf) = 20 ppm/°C were obtained for the BZN with 5.0 mol% B2 O3 sintered at 900 °C for 2 h. The BBZN ceramics were not sintered below 900 °C and the microwave dielectric properties of the BBZN ceramics sintered at 900 °C were very low. However, when CuO was added, BBZN ceramic was well sintered even at 875 °C. The liquid phase related to the BaCu(B2O5) second phase could be responsible for the decrease of sintering temperature. Good microwave dielectric properties of εr = 36, Q × f = 19,000 GHz and τf = 21 ppm/°C can be obtained for CuO doped BBZN ceramics sintered at 875 °C for 2 h.

Original languageEnglish
Pages (from-to)2139-2142
Number of pages4
JournalJournal of the European Ceramic Society
Volume26
Issue number10-11
DOIs
Publication statusPublished - 2006

Bibliographical note

Funding Information:
This work was supported by the Ministry of Science and Technology through the Project of International Research of the Science and Technology and one of the authors also acknowledges that this work was financially supported by the Ministry of Science and Technology through the NRL Project.

Keywords

  • Ba(ZnNb)O
  • Dielectric properties
  • Microstructure

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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