Effect of B2O3 and CuO on the sintering temperature and microwave dielectric properties of Ba(Zn1/3Ta 2/3)O3 ceramics

Min Han Kim, Sahn Nahm, Woo Sung Lee, Myong Jae Yoo, Nam Kee Kang, Hyo Tae Kim, Hwack Joo Lee

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

Sintering temperature of the Ba(Zn1/3Ta2/3)O 3 (BZT) ceramic is about 1550°C and it decreased to 950°C when B2O3 was added. The BaB4O7 second phase whose melting temperature is 889°C was found in the B 2O3 added BZT ceramics. The BaB4O7 second phase assisted the sintering of the BZT ceramics at 950°C. However, the B2O3 added BZT ceramic was not sintered below 950°C and the microwave dielecric properties were not satisfactory. On the other hand, when the B2O3 and the CuO were added, the BZT ceramic was sintered even at 870°C. The BaCu(B2O5) phase which was found in the CuO and B2O3 added BZT ceramics, existed as the liquid phase during the sintering and helped the densification of the BZT ceramics at temperatures lower than 950°C. Good microwave dielectric properties of Q × f = 11,000 GHz, ε r, = 26 and τf = 0.0 ppm/°C were obtained from the BZT + 5.0 mol% B2O3 + 10.0 mol% CuO ceramic sintered at 870°C for 2h.

Original languageEnglish
Pages (from-to)3091-3094
Number of pages4
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume44
Issue number5 A
DOIs
Publication statusPublished - 2005 May

Keywords

  • Ba(ZnTa)O
  • BaCu(bO)
  • LTCC
  • Microwave dielectric properties

ASJC Scopus subject areas

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

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