Origin of microwave dielectric loss in ZnNb2O6-TiO2

Dong Wan Kim, Kyung Hyun Ko, Do Kyun Kwon, Kug Sun Hong

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54 Citations (Scopus)

Abstract

(1-x)ZnNb2O6·xTiO2 ceramics were prepared using both anatase and rutile forms of TiO2. At a composition of x = 0.58, a mixture region of ixiolite (ZnTiNb2O8) and rutile was observed and the temperature coefficient of resonant frequency (τf) was ∼0 ppm/°C. We found that although εr and τf were comparable, the quality factor (Q × f, Q ≈ 1/tan δ,f = resonant frequency) of 0.42 ZnNb2O6·0.58 TiO2 prepared from anatase and rutile was 6000 and 29 000, respectively. The origin of the difference in Q × f of both samples was investigated by measuring electrical conductivity and by analysis of the anatase-rutile phase transition. The anatase-derived sample had higher conductivity, which was related to the reduction of Ti4+. It is suggested that the increase of dielectric loss originates from an increase in Ti3+ and oxygen vacancies due to an anatase-rutile phase transition.

Original languageEnglish
Pages (from-to)1169-1172
Number of pages4
JournalJournal of the American Ceramic Society
Volume85
Issue number5
DOIs
Publication statusPublished - 2002 May

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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