Electrical conductivities of CaO doped ZrO2-CeO2 solid solution system

Kenichi Kawamura, Kensuke Watanabe, Takahiro Hiramatsu, Atsushi Kaimai, Yutaka Nigara, Tatsuya Kawada, Junichiro Mizusaki

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)

Abstract

Electrical conductivities, σ, of (Zr1-xCexO2)0.9(CaO) 0.1 (x=0.1-1.0) were investigated by a D.C. four terminal technique at 1173-1573 K as a function of the oxygen partial pressure from 10-15 to 1 atm. In the region of x=0.4-1.0, the electrical conductivity is separated into the ionic and electronic conductivity by using the relation of σ=σione°P O2-1/4. The electrical conduction at PO2=1 atm is essentially ionic. The composition dependence of the electronic conductivity shows opposite tendency to that of the ionic conductivity, that is, the electronic conductivities increase with the increase in CeO2 content (x) and show a maximum at x ≃ 0.6, then decrease with x while the ionic conductivity behaves vice versa. In the CaO doped ZrO2-CeO2 system, the formation of the solid solution results in the low ionic and high electronic conduction.

Original languageEnglish
Pages (from-to)11-18
Number of pages8
JournalSolid State Ionics
Volume144
Issue number1-2
DOIs
Publication statusPublished - 2001 Sep 1

Keywords

  • Ceria
  • Double-layered electrolyte
  • Lime
  • SOFC
  • Zirconia

ASJC Scopus subject areas

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

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