Microstructural aspects of the ionic transport properties of strontium-substituted lanthanum cobaltites

W. Sitte*, E. Bucher, W. Preis, I. Papst, W. Grogger, F. Hofer

*Korrespondierende/r Autor/in für diese Arbeit

Publikation: Beitrag in einer FachzeitschriftKonferenzartikel

Abstract

The ionic conductivity and microstructure of selected compositions of the solid solution La1-xSrxCoO3-δ (LSC) were examined with respect to possible vacancy ordering phenomena. Homogeneous samples of LSC were prepared by the glycine nitrate process. The ionic conductivity was obtained as a function of the oxygen partial pressure (-3.5 ≤ log[p(O2)/atm] ≤ 0.5) using a recently developed galvanostatic polarization technique. At 825°C the p(O2)-dependence of the ionic conductivity of La1-xSrxCoO3-δ (x = 0.4 and 0.6) shows a distinct maximum. Although this behavior has yet to be explained unambiguously it is indicative of decreasing mobility of ionic charge carriers, e.g. due to cooperative vacancy ordering. From the temperature dependence of the ionic conductivity of La1-xSrxCoO3-δ (x = 0.6) activation energies at constant nonstoichiometry (0.20 ≤ δ ≤ 0.28) were obtained. As vacancy association and microstructure are presumed to play a significant role we combined the results of ionic conductivity measurements and electron microscopical investigations. HRTEM images revealed a superstructure within microdomains of about 100 nm in size.

Originalspracheenglisch
Seiten (von - bis)527-532
Seitenumfang6
FachzeitschriftMaterials Research Society Symposium Proceedings
Jahrgang756
DOIs
PublikationsstatusVeröffentlicht - 25 Jul 2003
VeranstaltungSolid State Ionics 2002 - Boston MA, USA / Vereinigte Staaten
Dauer: 2 Dez 20025 Dez 2002

ASJC Scopus subject areas

  • !!Materials Science(all)
  • !!Condensed Matter Physics
  • !!Mechanics of Materials
  • !!Mechanical Engineering

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