Hydroxyl Defect Effect on Reoxidation of Sc-Doped (Ba,Ca)(Ti,Zr)O3 Fired in Reducing Atmospheres

Yu Ju Kao, Che Yi Su, Christian Pithan, Detlev F. Hennings, Chi-Yuen Huang, Rainer Waser

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The behavior of grain and grain-boundary conductivity of acceptor (Sc)-doped (Ba,Ca)(Ti,Zr)O3 ceramics sintered in moist reducing atmosphere and subsequently reoxidized in dry and moist atmosphere was investigated by means of impedance spectroscopy (IS). In moist firing atmosphere, water vapor was found to react with oxygen vacancies, forming positively charged hydroxyl defects (OH)0• on regular oxygen sites in the crystal lattice. Proton hopping is considered to raise the ionic conductivity significantly. Therefore, hydroxyl defects (OH)0• in turn influence the grain conduction. Hydroxyl defects (OH)0• are also considered to be responsible for alternations of the dielectric maximum at the Curie point.

Original languageEnglish
Pages (from-to)1311-1317
Number of pages7
JournalJournal of the American Ceramic Society
Volume99
Issue number4
DOIs
Publication statusPublished - 2016 Apr 1

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Hydroxyl Radical
Defects
Steam
Oxygen vacancies
Ionic conductivity
Crystal lattices
Water vapor
Protons
Grain boundaries
Spectroscopy
Oxygen

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

Cite this

Kao, Yu Ju ; Su, Che Yi ; Pithan, Christian ; Hennings, Detlev F. ; Huang, Chi-Yuen ; Waser, Rainer. / Hydroxyl Defect Effect on Reoxidation of Sc-Doped (Ba,Ca)(Ti,Zr)O3 Fired in Reducing Atmospheres. In: Journal of the American Ceramic Society. 2016 ; Vol. 99, No. 4. pp. 1311-1317.
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Hydroxyl Defect Effect on Reoxidation of Sc-Doped (Ba,Ca)(Ti,Zr)O3 Fired in Reducing Atmospheres. / Kao, Yu Ju; Su, Che Yi; Pithan, Christian; Hennings, Detlev F.; Huang, Chi-Yuen; Waser, Rainer.

In: Journal of the American Ceramic Society, Vol. 99, No. 4, 01.04.2016, p. 1311-1317.

Research output: Contribution to journalArticle

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AB - The behavior of grain and grain-boundary conductivity of acceptor (Sc)-doped (Ba,Ca)(Ti,Zr)O3 ceramics sintered in moist reducing atmosphere and subsequently reoxidized in dry and moist atmosphere was investigated by means of impedance spectroscopy (IS). In moist firing atmosphere, water vapor was found to react with oxygen vacancies, forming positively charged hydroxyl defects (OH)0• on regular oxygen sites in the crystal lattice. Proton hopping is considered to raise the ionic conductivity significantly. Therefore, hydroxyl defects (OH)0• in turn influence the grain conduction. Hydroxyl defects (OH)0• are also considered to be responsible for alternations of the dielectric maximum at the Curie point.

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