Microstructure and Microwave Dielectric Properties of (1-x)Ba(Co 1/3Nb2/3)O3-xBa(Zn1/3Nb 2/3)O3 Ceramics

Cheol Woo Ahn, Sahn Nahm, Seok Jin Yoon, Hyun Min Park, Hwack Joo Lee

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Abstract

The microstructure and microwave dielectric properties of (1-x)Ba(Co 1/3Nb2/3)O3-xBa(Zn1/3Nb 2/3)O3 [(1-x)BCN-xBZN] ceramics with 0.0 ≤ x ≤ 1.0 were investigated. When the sintering temperature was 1400°C, a homogeneous phase with a 1 : 2 ordered structure was found in the specimens with x ≤ 0.3 but for the specimens with x ≥ 0.6, a disordered structure and BaNb 6O16 second phase were found. The grain growth related to the BaNb6O16 second phase occurred in the specimens with x ≥ 0.5. The temperature coefficient of the resonant frequency (τ f) increased with increasing x, and the specimens with 0.3 ≤ x ≤ 0.4 have zero τj. Dielectric constant (εr increased with the increase in x and was about 34.5 when x = 0.3. For the specimens with x ≤ 0.3, the Q × f value was high but decreased as x exceeded 0.3. The maximum Q × f value, 97,000 GHz, was obtained for 0.7BCN-0.3BZN ceramics sintered at 1400°C for 20 h.

Original languageEnglish
Pages (from-to)6964-6968
Number of pages5
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume42
Issue number11
Publication statusPublished - 2003 Nov 1

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Keywords

  • Ba(Co Nb)O
  • Ba(ZnNb)O
  • Microstructure
  • Microwave dielectric properties

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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