The influence of alumina addition and its distribution upon grain-boundary conduction in 15 mol.% calcia-stabilized zirconia

Jong Heun Lee, Toshiyuki Mori, Ji Guang Li, Takayasu Ikegami, Satoshi Takenouchi

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

The improvement of grain-boundary conduction was studied in 15 mol.% calcia-stabilized zirconia (15CSZ) by adding Al2O3 in the forms of fine powder and single crystalline particles sized 4-10 μm as a scavenger for resistive siliceous phase. The addition of 1 mol.% Al2O3 improved the grain-boundary conduction when sintered at <1500°C, whereas it deteriorated at >1550°C. The restraining Al2O3 dissolution into inter-granular glass phase was a key feature for maximizing the scavenging efficiency. At 1450°C, the addition of single crystalline Al2O3 sized 4 and 10 μm enhanced grain-boundary conductivity by a factor of 14-16, whose enhancement was about twice of that by fine Al2O3 powder. It can be explained by the combination of the sufficient reaction path assisted by fast grain-boundary diffusion and the restraining glass phase formation by employing coarse and inactive single crystalline Al2O3 particles.

Original languageEnglish
Pages (from-to)269-276
Number of pages8
JournalCeramics International
Volume27
Issue number3
DOIs
Publication statusPublished - 2001
Externally publishedYes

Keywords

  • B. Grain boundaries
  • C. Impedance
  • C. Ionic conductivity
  • Calcia-stabilized zirconia

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Process Chemistry and Technology
  • Surfaces, Coatings and Films
  • Materials Chemistry

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