Microwave Dielectric Properties of Bi2(Zn1/3Ta 2/3)2O7 Polymorphs

Hee Bum Hong, Dong Wan Kim, Kug Sun Hong

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Polymorphic phases of Bi2(Zn1/3Ta2/3) 2O7 pyrochlore were studied. A metastable monoclinic structure was observed at temperatures below 950°C. This low-temperature phase possesses highly temperature-stable characteristics in the microwave frequency range (5-7 GHz) with a temperature coefficient of resonant frequency (τf) = -8.8ppm/°C. The addition of B2O 3 to Bi2(Zn1/3Ta2/3) 2O7 significantly lowered the sintering temperature, to 850°C, without an associated structural transition. Low-temperature sintering mechanisms have been investigated using dilatometry and transmission electron microscopy. Bi2(Zn1/3Ta2/3) 2O7 with 0.5 wt% B2O3 can be suitable for application in low-temperature cofired ceramics (LTCC), due to its reduced sintering temperature and good microwave dielectric properties: quality factor (Q × f) = 3500 GHz at 6.7 GHz, dielectric constant (ε r) = 63.9 and τf = -14.1 ppm/°C.

Original languageEnglish
Pages (from-to)5172-5175
Number of pages4
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume42
Issue number8
DOIs
Publication statusPublished - 2003 Aug
Externally publishedYes

Keywords

  • Bi(ZnTa)O
  • LTCC
  • Microwave dielectric properties
  • Polymorphs

ASJC Scopus subject areas

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

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