Protonic and electronic conductivities of terbium doped strontium cerates

Xiaotong Wei, Y. S. Lin

Research output: Contribution to journalArticlepeer-review

30 Scopus citations

Abstract

Electronic and protonic conductivities of Tb doped SrCeO3 were measured in a hydrogen containing and hydrogen-free atmosphere of the same oxygen partial pressure in 500-900 °C. In a H2 containing atmosphere, the material exhibits mixed electronic and proton-conductivity and, for SrCe0.95Tb0.05O3-δ, the proton transfer number increases with decreasing temperature, from about 0.4 at 900 °C to about 0.8 at 500 °C. The total conductivity for SrCe0.95Tb0.05O3-δ decreases from about 3 × 10- 3 S/cm in the reducing atmosphere to 4 × 10- 5 S/cm in air at 900 °C with an activation energy respectively of 39 kJ/mol and 76 kJ/mol for protonic and n-type electronic conduction. Results of XRD analysis show a decrease in the lattice volume of the SrCe1-xTb xO3-δ with increasing Tb concentration. SrCe1-xTb xO3-δ exhibits negligible proton-conductivity with x smaller than 0.005. At 800 °C under a reducing atmosphere, SrCe1-xTbxO3-δ, with x > 0.005, are mixed electronic and proton conductors with a maximum proton-conductivity of about 3 × 10- 3 S/cm at x = 0.025 and proton transfer number of about 0.7 for x in the range of 0.005-0.125.

Original languageEnglish (US)
Pages (from-to)1804-1810
Number of pages7
JournalSolid State Ionics
Volume178
Issue number35-36
DOIs
StatePublished - Feb 15 2008

Keywords

  • Conductivity
  • Oxygen vacancy
  • Strontium cerate
  • Terbium

ASJC Scopus subject areas

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

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