Additions and corrections

Diffusion of La and Mn in Ba_0.5Sr_0.5Co_0.8Fe_0.2O_3-delta polycrystalline ceramics

Steven P. Harvey, Roger A. De Souza and Manfred Martin

Energy Environ. Sci., 2012, 5, 5803–2813, DOI: 10.1039/C1EE02740A. Amendment published 14^th August 2012.

The authors would like to inform the community that the activation energies published in our paper are in error. The authors neglected to include the factor of ln(10)=2.3 in analyzing the activation energies, and thus all activation energies determined in the publication are underestimated by a factor of 2.3.

While this now gives values for the (equal) activation energies for La and Mn cation diffusion in BSCF of EA = (3.7 ± 0.5) eV, it does not change the interpretation of the data and the suggested mechanism of coupled cation migration in BSCF. In section 4.2 the activation energy is compared to other perovskite systems, with the observation that the reported activation energy is much lower than in other perovskite systems. The true activation energy of (3.7 ± 0.5) eV is actually now similar to those observed in many other perovskite systems.

The activation energies for grain-boundary diffusion reported in section 3.3 are also affected. The reported activation energies for grain-boundary diffusion of lanthanum should be (3.7 ± 0.5) eV, and of manganese, (4.6 ± 0.5) eV.

The analysis of the activation energy and oxygen partial pressure dependence of the cation diffusion in section 4.2 is still valid, and Equation 16 still indicates a variation in the migration enthalpy of vacancies with increasing temperature. While Equation 16 may no longer justify a very small activation energy, we believe it is still valid.

The Royal Society of Chemistry apologises for these errors and any consequent inconvenience to authors and readers.

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