Three new ordering schemes for oxygen vacancies in CaMnO3–x superlattices based on square-pyramidal co-ordination of Mn3+

Abstract

Electron diffraction and high resolution electron microscopy have brought to light three new ordered structures in a material of composition CaMnO_{(2.50 ± 0.02)}; in all these structures as well as in another analogous oxide, CaMnO_2.75, the original features of the perovskite structure are preserved, thus offering an explanation for the facile loss and uptake of oxygen properties that these selective oxidation catalysts possess.