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Issue 1, 2001
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Crystal structure and electronic propertiesof Ca4Mn2TiO9.93, an n = 3Ruddlesden–Popper compound

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Traditional solid state synthetic methods were used to prepare a polycrystalline sample of the n = 3 Ruddlesden–Popper phase Ca4Mn2TiO9.93. The crystal structure (space group Pbca, a = 5.31411(5), b = 5.31148(5), c = 26.9138(2) Å) was determined by the simultaneous analysis of neutron and X-ray diffraction data, with near-edge anomalous scattering being used to provide contrast between Mn and Ti cations. The latter show a small preference for the octahedral sites at the centre of the three-layer perovskite blocks within the structure. Neutron diffraction data collected at 5 K show no evidence for long-range magnetic ordering, although an enhanced magnetisation with a weak remanence is observed at low temperature; this is ascribed to the presence of antisymmetric exchange interactions. Ca4Mn2TiO9.93 is a semiconductor with a temperature-dependent activation energy of ∼100 meV. Only weak (ρB/ρ0 > 0.9 in 14 T at 75 K) magnetoresistance was observed.

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Publication details

The article was received on 22 May 2000, accepted on 29 Jun 2000 and first published on 10 Oct 2000

Article type: Paper
DOI: 10.1039/B003189P
Citation: J. Mater. Chem., 2001,11, 160-167
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    Crystal structure and electronic properties of Ca4Mn2TiO9.93, an n = 3 Ruddlesden–Popper compound

    P. D. Battle, S. J. Blundell, A. I. Coldea, E. J. Cussen, M. J. Rosseinsky, J. Singleton, L. E. Spring and J. F. Vente, J. Mater. Chem., 2001, 11, 160
    DOI: 10.1039/B003189P

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