Oxygen diffusion and surface exchange studies on (La0.75Sr0.25)0.95Cr0.5Mn0.5O3-δ

John Thomas Sirr Irvine, ES Raj, JA Kilner

Research output: Contribution to journalArticlepeer-review

46 Citations (Scopus)

Abstract

Oxygen tracer diffusion coefficient (D*) and surface exchange coefficient (k*) have been measured for (La0.75Sr0.25)(0.95-)Cr0.5Mn0.5O3-delta using isotopic exchange and depth profiling by secondary ion mass spectrometry technique as a function of temperature (700-1000 degrees C) in dry oxygen and in a water vapour-forming gas mixture. The typical values of D* under oxidising and reducing conditions at similar to 1000 degrees C are 4 x 10(-10) cm(2) s(-1) and 3 x 10(-8) cm(2) s(-1) respectively, whereas the values of k* under oxidising and reducing conditions at 1000 degrees C are 5 x 10(-8) cm s(-1) and 4 x 10(-8) cm s(-1) respectively. The apparent activation energies for D* in oxidising and reducing conditions are 0.8 eV and 1.9 eV respectively. (c) 2006 Elsevier B.V. All rights reserved.

Original languageEnglish
Pages (from-to)1747-1752
Number of pages6
JournalSolid State Ionics
Volume177
DOIs
Publication statusPublished - 15 Oct 2006

Keywords

  • oxygen diffusion
  • surface exchange
  • SIMS
  • IEDP
  • LSCM
  • FUEL-CELLS
  • TRACER DIFFUSION
  • TRANSPORT
  • OXIDES
  • ANODE

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