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2005
Structure
D 2000
09- 008
Structural—Magnetic Properties Relationship in a New Commensurate Material:
Sr9Mn5Co 2O21. — The title compound is synthesized by reaction of a stoichiometric
mixture of SrCO3, Co3O4, and MnO2 in air (1200 °C, 7 d; quenching). The polycrystalline samples are characterized by X-ray and electron diffraction, high-resolution electron microscopy, and magnetic measurements. Sr9Mn5Co2O21 , which constitutes the
m = 2, n = 1 term of the homologous series (A3B2O6)m(A3B3O9)n, crystallizes in the
rhombohedral space group R3c. Isolated rows of polyhedra sharing faces along the
c-axis are made up of units of two and three face-sharing octahedra (occupied by Mn)
linked by one trigonal prism (occupied by Co) in an ordered way. The chains are separated by columns of Sr atoms. The compound behaves as a magnetically disordered
system. The magnetic properties suggest antiferromagnetic correlations along the
chains, but no long-range magnetic order is achieved. — (BOULAHYA, K.;
PARRAS, M.; GONZALEZ-CALBET*, J. M.; MARTINEZ, J. L.; Chem. Mater. 16
(2004) 25, 5408-5413; Dep. Quim. Inorg., Fac. Cienc. Quim., Univ. Complutense,
E-28040 Madrid, Spain; Eng.) — Schramke
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