Refinement of the crystal structures of strontium cobalt oxychlorides by neutron powder diffraction

S. M. Loureiro, C. Felser, Q. Huang, Robert Joseph Cava

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Abstract

The crystal structures of strontium cobalt oxychlorides of general formula Sr2CoO3Cl (Co-1L), Sr3Co2O5Cl2 (Co-2L), and Sr4Co3O7.5Cl2 (Co-3L) have been determined from neutron powder data. The compounds crystallize in tetragonal symmetry, space group P4/nmm (Co-1L) or I4/mmm (Co-2L and Co-3L). Their structures are analogous to the Ruddlesden-Popper phases of general formula Sr(n+1)M(n)O(2n+1). All three structures contain layers of highly distorted CoO5Cl octahedron. The Co-3L structure, in addition, has a layer of regular CoO6 octahedra. Because the in-plane oxygen position of the latter is partially occupied, some of the Co atoms adopt pyramidal coordination, with their basal planes parallel to the c-axis. The temperature dependence of the magnetic susceptibility is also reported. The moment per mole of Co atom decreases with increasing number of (CoO2) layers.

Original languageEnglish (US)
Pages (from-to)3181-3185
Number of pages5
JournalChemistry of Materials
Volume12
Issue number10
DOIs
StatePublished - Nov 2 2000

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

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