Ba0.5Sr0.5Co0.8Fe0.2O3-δ (BSCF) was an interesting material for high temperature

oxygen permeation membranes and solid oxide fuel cell cathodes, applications for

which oxygen transport properties were crucial. Here oxygen isotope exchange was

performed on dense BSCF films prepared by pulsed laser deposition on MgO

single crystal substrates. The oxygen isotope profile was analyzed by secondary ion

mass spectrometry to extract tracer diffusion coefficients D* and effective surface

exchange constants k*. Tracer diffusion has a low activation energy of 0.5eV. At

moderate temperatures, the related oxygen vacancy diffusion coefficient DV

o was

significantly larger than that for (La,Sr)(Fe,Co)O3−δ perovskites.

Oxygen Tracer Diffusion in Dense Ba0.5Sr0.5Co0.8Fe0.2O3−δ Films. L.Wang,

R.Merkle, J.Maier, T.Acartürk, U.Starke: Applied Physics Letters, 2009, 94[7],

071908