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 journalArticlepeer-review

5 Citations (Scopus)


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
Issue number4
Publication statusPublished - 2016 Apr 1

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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