Oxygen tracer diffusion coefficient of (La, Sr)MnO3±δ

Isamu Yasuda, Kei Ogasawara, Masakazu Hishinuma, Tatsuya Kawada, Masayuki Dokiya

Research output: Contribution to journalArticlepeer-review

150 Citations (Scopus)

Abstract

To understand the mechanism of oxygen diffusion, the oxygen tracer diffusion coefficient, D*O, of strontium-doped lanthanum manganites, La1-xSrxMnO3±δ (x=0.05, 0.10, 0.15 and 0.20) was measured as a function of composition, temperature and oxygen partial pressure. The measured D*O was as low as 10-12 to 10-11 cm2 s-1 at 1000°C, from which the ionic conductivity of 10-7 to 10-6 S/cm was estimated. Because of such a poor ionic conductivity, the possibility for the bulk diffusion of oxide ions to contribute to the cathode reactions in solid oxide fuel cells is considered to be sparse. The negative dependence of D*O on the oxygen partial pressure suggests the vacancy mechanism for oxygen diffusion.

Original languageEnglish
Pages (from-to)1197-1201
Number of pages5
JournalSolid State Ionics
Volume86-88
Issue numberPART 2
DOIs
Publication statusPublished - 1996 Jan 1

Keywords

  • Ion conductivity
  • Oxygen diffusion
  • Polarization loss
  • Solid oxide fuel cell

ASJC Scopus subject areas

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

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