Improvement of grain-boundary conduction in gadolinia-doped ceria via post-sintering heat treatment

Dong Suk Kim, Pyeong Seok Cho, Jong Heun Lee, Doh Yeon Kim, Sung Bo Lee

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

A new approach to improve the grain-boundary conduction in 10 mol% gadolinia-doped ceria (GDC) without any additives was suggested. The grain-boundary conductivity of GDC specimen containing 500 ppm of SiO2 was increased ∼4 times by post-sintering heat-treatment (HT) at 1350 °C for 20 h. The grain-boundary conductivity showed the maximum at HT temperature of 1350 °C and enhanced with increasing HT time from 0 to 20 h. The mechanism for scavenging resistive siliceous phase by post-sintering HT was investigated with the variation of HT temperatures, HT times, and HT schedules.

Original languageEnglish
Pages (from-to)2125-2128
Number of pages4
JournalSolid State Ionics
Volume177
Issue number19-25 SPEC. ISS.
DOIs
Publication statusPublished - 2006 Oct 15

Keywords

  • Gadolinia-doped ceria (GDC)
  • Grain-boundary conduction
  • Post-sintering heat treatment
  • Scavenging

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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