Precursor scavenging of resistive grain-boundary phase in 8 mol % ytterbia-stabilized zirconia

Jong Heun Lee, Toshiyuki Mori, Ji Guang Li, Takayasu Ikegami, John Drennan, Doh Yeon Kim

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The grain-boundary conduction of 8 mol % ytterbia-stabilized zirconia (8YbSZ) was improved markedly by precursor scavenging via the two-stage sintering process. The most significant increase in the grain-boundary conductivity was found when the sample, whose conductivity was higher than that via Al2O3-derived scavenging, was heat-treated at 1250°C for ≥ 20 h. The formation of a stable Si-containing phase such as ZrSiO4 during the first-stage heat-treatment was suggested as one probable scavenging route from the optimal heat-treatment temperature (HTT), long duration time (>20 h) at HTT, and the stability of the formed phase up to sintering temperatures (1500°C).

Original languageEnglish
JournalJournal of the Electrochemical Society
Issue number3
Publication statusPublished - 2002 Mar 1
Externally publishedYes


ASJC Scopus subject areas

  • Electrochemistry
  • Surfaces, Coatings and Films
  • Surfaces and Interfaces

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