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Synthesis and characterization of the reduced double-layer manganite Sr3Mn2O6+x

By Lisa .J. Gillie, A.J. Wright, J. Hadermann, G. Van Tendeloo and C. Greaves

Abstract

The oxygen-deficient Ruddlesden–Popper (RP) phase Sr3Mn2O6 crystallizes with an ordered array of oxygen vacancies to afford a structure in which the Mn3+ ions exist in a square-pyramidal environment. The MnO5 polyhedra are linked through their corners to form a structure that is related to that observed for the single-layered material, Sr2MnO3.5. The nuclear and magnetic structures of a polycrystalline sample of Sr3Mn2O6 have been determined using Rietveld analysis of neutron powder diffraction data and electron diffraction techniques. The pure Mn3+ double-layered phase crystallizes in a superstructure of the simple RP subcell: tetragonal, P4/mbm, a=10.8686(2) Å and c=20.2051(3) Å. Magnetic susceptibility studies suggest a transition at 250 K to a canted antiferromagnetic ordered structure. The magnetic unit-cell consists of ferromagnetic clusters of corner-sharing MnO5 units, which are antiferromagnetically aligned to other clusters within the layers

Topics: Q1, QD
Publisher: Elsevier
Year: 2003
DOI identifier: 10.1016/s0022-4596(03)00245-7
OAI identifier: oai:eprints.hud.ac.uk:4171
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