Oxygen tracer diffusion in dense Ba0.5Sr0.5Co0.8Fe0.2O3−δ films
- 16 February 2009
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 94 (7), 071908
- https://doi.org/10.1063/1.3085969
Abstract
Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3 - δ (BSCF) is an interesting material for high temperature oxygen permeation membranes and solid oxide fuel cell cathodes, applications for which oxygen transport properties are crucial. Here oxygen isotope exchange is performed on dense BSCF films prepared by pulsed laser deposition on MgO single crystal substrates. The oxygen isotope profile is 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 0.5 eV. At moderate temperatures, the related oxygen vacancy diffusion coefficient DVÖ is significantly larger than that for (La,Sr)(Fe,Co)O3−δ perovskites.This publication has 17 references indexed in Scilit:
- Oxygen nonstoichiometry and exchange kinetics of Ba0.5Sr0.5Co0.8Fe0.2O3−δSolid State Ionics, 2008
- Re-evaluation of Ba0.5Sr0.5Co0.8Fe0.2O3−δ perovskite as oxygen semi-permeable membraneJournal of Membrane Science, 2007
- Quantitative Comparison of Mixed Conducting SOFC Cathode Materials by Means of Thin Film Model ElectrodesJournal of the Electrochemical Society, 2007
- Ba0.5Sr0.5Co0.8Fe0.2O3−δ thin film microelectrodes investigated by impedance spectroscopySolid State Ionics, 2006
- Oxygen Stoichiometry and Chemical Expansion of Ba0.5Sr0.5Co0.8Fe0.2O3-δ Measured by in Situ Neutron DiffractionChemistry of Materials, 2006
- Oxygen permeability and stability of Ba0.5Sr0.5Co0.8Fe0.2O3−δ as an oxygen-permeable membrane at high pressuresSolid State Ionics, 2006
- A high-performance cathode for the next generation of solid-oxide fuel cellsNature, 2004
- Oxygen permeation study in a tubular Ba0.5Sr0.5Co0.8Fe0.2O3-δ oxygen permeable membraneJournal of Membrane Science, 2002
- Investigation of the permeation behavior and stability of a Ba0.5Sr0.5Co0.8Fe0.2O3−δ oxygen membraneJournal of Membrane Science, 2000
- Oxygen transport in La1−xSrxMn1−yCoyO3±δ perovskites Part I. Oxygen tracer diffusionSolid State Ionics, 1998