Retraction Note to: J Mater Sci (2007) 42:7461–7466 DOI 10.1007/s10853-006-1486-5

Following detailed consultation with the Editor-in-Chief, the publisher has retracted this article, since it plagiarizes a paper entitled “Optimization of ionic conductivity in doped ceria” which was authored by D. A. Andersson, S.I. Simak, N.V. Skorodumova, I.A. Abrikosov, and B. Johansson, published in Proceedings of the National Academy of Science in 2006 103:3518–3521.