Refinement of the Crystal Structures of Strontium Cobalt Oxychlorides by 
Neutron Powder Diffraction

Loureiro, S. M.; Felser, C.; Huang, Q.; Cava, R. J.

doi:10.1021/cm000410m

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Refinement of the Crystal Structures of Strontium Cobalt Oxychlorides by Neutron Powder Diffraction

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Loureiro, S. M., Felser, C., Huang, Q., & Cava, R. J. (2000). Refinement of the Crystal Structures of Strontium Cobalt Oxychlorides by Neutron Powder Diffraction. Journal of Materials Chemistry, 12(10), 3181-3185. doi:10.1021/cm000410m.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0018-5738-6

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 Srn+1MnO2n+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.