Dielectric Relaxations of Y-Doped ZrO2 Single Crystal

Frequency dependences of dielectric constant (εr′) for 9 mol% Y2O3 doped ZrO2 (YSZ) single crystal which is a typical oxide-ion conductor was successfully explained by the superimposition of both electrolyte-electrode interfacial and Debye-type polarizations. Three kinds of Debye-type polarizations...

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Bibliographic Details
Published inJournal of the Ceramic Society of Japan Vol. 115; no. 1345; pp. 546 - 550
Main Authors YAMAMURA, Hiroshi, YAGI, Yuhji, KAKINUMA, Katsuyoshi
Format Journal Article
LanguageEnglish
Published Tokyo The Ceramic Society of Japan 2007
Japan Science and Technology Agency
Subjects
Dielectric property
Dopant-vacancy associate
Electric modulus
Oxide-ion conductivity
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Summary:Frequency dependences of dielectric constant (εr′) for 9 mol% Y2O3 doped ZrO2 (YSZ) single crystal which is a typical oxide-ion conductor was successfully explained by the superimposition of both electrolyte-electrode interfacial and Debye-type polarizations. Three kinds of Debye-type polarizations were observed at fairly high temperatures. The two polarizations were ascribed to defect associates, (YZr′-VO••)•, which were observed in the tan δ spectra. The third polarization in the high frequency region was ascribed to a long range migration of oxygen vacancy, which was observed in the M″ spectra. The σac dispersion was also explained by the Debye-type polarizations.
ISSN:1882-0743
1348-6535
DOI:10.2109/jcersj2.115.546