Origin of microwave dielectric loss in ZnNb 2O 6-TiO 2

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

Research output: Contribution to journalArticle

54 Citations (Scopus)

Abstract

(1-x)ZnNb 2O 6·xTiO 2 ceramics were prepared using both anatase and rutile forms of TiO 2. At a composition of x = 0.58, a mixture region of ixiolite (ZnTiNb 2O 8) and rutile was observed and the temperature coefficient of resonant frequency (τ f) was ∼0 ppm/°C. We found that although ε r and τ f were comparable, the quality factor (Q × f, Q ≈ 1/tan δ,f = resonant frequency) of 0.42 ZnNb 2O 6·0.58 TiO 2 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 Ti 4+. It is suggested that the increase of dielectric loss originates from an increase in Ti 3+ 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
Publication statusPublished - 2002 May 1
Externally publishedYes

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anatase
Dielectric losses
rutile
Titanium dioxide
Microwaves
phase transition
Natural frequencies
Phase transitions
Q factor
Oxygen vacancies
ceramics
electrical conductivity
conductivity
loss
microwave
titanium dioxide
oxygen
Chemical analysis
temperature
Temperature

ASJC Scopus subject areas

  • Ceramics and Composites

Cite this

Origin of microwave dielectric loss in ZnNb 2O 6-TiO 2 . / Kim, Dong-Wan; Ko, Kyung Hyun; Kwon, Do Kyun; Hong, Kug Sun.

In: Journal of the American Ceramic Society, Vol. 85, No. 5, 01.05.2002, p. 1169-1172.

Research output: Contribution to journalArticle

Kim, D-W, Ko, KH, Kwon, DK & Hong, KS 2002, 'Origin of microwave dielectric loss in ZnNb 2O 6-TiO 2 ', Journal of the American Ceramic Society, vol. 85, no. 5, pp. 1169-1172.
Kim, Dong-Wan ; Ko, Kyung Hyun ; Kwon, Do Kyun ; Hong, Kug Sun. / Origin of microwave dielectric loss in ZnNb 2O 6-TiO 2 In: Journal of the American Ceramic Society. 2002 ; Vol. 85, No. 5. pp. 1169-1172.
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