Effect of microstructure on microwave dielectric properties of Al 2O3-added Ba(Zn1/3Ta2/3)O 3 ceramics

Min Han Kim, Sahn Nahm, Woo Sung Lee, Myong Jae Yoo, Jong Cheol Park, Hwack Joo Lee

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14 Citations (Scopus)

Abstract

The effects of Al2O3 additive on the microstructure and microwave dielectric properties of Ba(Zn1/3Ta2/3) O3 (BZT) ceramics were investigated. The BZT ceramics has a 1 : 2 ordered hexagonal structure. The degree of the 1 : 2 ordering did not decrease with the addition of Al2O3. Grain growth occurred and the liquid phase formed for the Al2O3-added BZT ceramics sintered above 1580°C. The liquid phase contains high concentrations of Ba and Al ions, which could be responsible for the grain growth. When a small amount of Al2O3 was added, the relative density slightly decreased but the Q value was markedly enhanced. The increase in the Q value was not related to the relative density or the 1 : 2 ordering. In contrast, the improvement in the Q value occurred in specimens in which grain growth occurred. Therefore, the increase in the grain size is considered to be responsible for the improvement in the Q value of Al2O3-added BZT.

Original languageEnglish
Pages (from-to)1438-1441
Number of pages4
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume43
Issue number4 A
DOIs
Publication statusPublished - 2004 Apr

Keywords

  • 1:2 ordering
  • AlO
  • Ba(ZnTa)O
  • Grain size
  • Q value

ASJC Scopus subject areas

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

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