This document is the unedited author's version of a Submitted Work that was subsequently accepted for publication in Inorganic Chemistry, copyright © American Chemical Society after peer review. To access the final edited and published work, see http://pubs.acs.org/articlesonrequest/ AOR-WNt7J768meVUhMTtCvNf http://dx.doi.org/10.1021/ic402988y Clemens, O.; Gröting, M.; Witte, R.; Perez-Mato, J. M.; Loho, C.; Berry, F. J.; Kruk, R.; Knight, K. S.; Wright, A. J.; Hahn, H.; Slater, P. R., Crystallographic and Magnetic Structure of the Perovskite-Type Compound BaFeO 2.5 : unrivaled complexity in oxygen vacancy ordering. Inorganic Chemistry 2014, 53, (12), 5911-5921.