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 DVo 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