Improvement of grain-boundary conduction in gadolinia-doped ceria by the addition of CaO

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

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

This study examined the effect of CaO addition on grain-boundary conductivity in 10 mol % Gd 2O 3-doped CeO 2 containing 500 ppm SiO 2 as an impurity. The addition of CaO increased the grain-boundary conductivity ∼50 times without affecting the grain-interior conductivity significantly. CaO was incorporated into the CeO 2 lattice completely, which means that a scavenging reaction between a large CaO-related second phase and siliceous impurity was not the reason for the increased conductivity. After adding CaO, grain boundary structure changed from random to faceted. Configuration change in the grain-boundary segregation in relation to the boundary-structure variation is suggested as a possible reason.

Original languageEnglish
JournalElectrochemical and Solid-State Letters
Volume9
Issue number9
DOIs
Publication statusPublished - 2006 Aug 3

ASJC Scopus subject areas

  • Electrochemistry
  • Materials Science(all)

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