Effects of microstructure on the microwave dielectric properties of Ba(Co1/3Nb2/3)O3 and (1-x)Ba (Co1/3Nb2/3)O3-xBa(Zn1/3 Nb2/3) O3 ceramics

Cheol Woo Ahn, Hyun Jung Jang, Sahn Nahm, Hyun Min Park, Hwack Joo Lee

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Abstract

Ba(Co1/3Nb2/3)O3(BCN) has a 1:2 ordered hexagonal structure. A large amount of the liquid phase, which contains high concentrations of Ba and Nb ions was found in the BCN ceramics. Q-values of BCN increased with increasing sintering temperature; however, it significantly decreased when the sintering temperature exceeded 1400 °C. The presence of a large amount of liquid phase could be responsible for the decrease of the Q-value. For (1 - x)Ba(Co1/3 Nb2/3)O3-xBa(Zn1/3Nb2/3) O3[(1 - x)BCN-xBZN] ceramics, the 1:2 ordered hexagonal structure was observed in the specimens with x ≤ 0.3 and the BaNb6O16 second phase was found in the specimens with x ≥ 0.6. Grain growth, which is related to the BaNb6 O16 second phase occurred in the specimens with x ≥ 0.5. In this work, the excellent microwave dielectric properties of τf = 0.0 ppm/°C, εr = 34.5 and Q × f = 97,000 GHz were obtained for the 0.7BCN-0.3BZN ceramics sintered at 1400 °C for 20 h.

Original languageEnglish
Pages (from-to)2473-2478
Number of pages6
JournalJournal of the European Ceramic Society
Volume23
Issue number14
DOIs
Publication statusPublished - 2003 Jan 1

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Keywords

  • Dielectric properties
  • Microstructure-final
  • Niobates
  • Perovskite
  • Sintering

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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