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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/4026
Title: Synthesis, crystal structure, and magnetic properties of Sr 1.31Co0.63Mn0.37O3: A derivative of the incommensurate composite hexagonal perovskite structure
Authors: Mandal, Tapas Kumar
Abakumov A.M.
Hadermann J.
Van Tendeloo G.
Croft M.
Greenblatt M.
Published in: Chemistry of Materials
Abstract: We report the synthesis, structural investigation, and magnetic property studies of Sr1.31Co0.63Mn0.37O3 that adopts an incommensurate composite hexagonal perovskite-related structure. The crystal structure has been solved using a (3 + 1)-dimensional superspace approach from powder X-ray and neutron diffraction data (SSG R3Ì„m(00γ)0s, a = 9.5548(1) Ã…, c = 2.5599(1) Ã…, q = 0.65581(4)c*, AB = 0.041, Rp = 0.059). The structure consists of face-sharing chains of octahedra and trigonal prisms, wherein the trigonal prismatic sites are preferentially occupied by Co with some cation disorder. A combination of electron diffraction and high-resolution electron microscopic analysis has demonstrated that the compound possesses a complicated microstructure related to the formation of domains with slightly different lengths of the modulation vector. X-ray absorption near-edge spectroscopic (XAS) studies clearly indicate the presence of Mn in the 4+ and Co in the 3+ oxidation state. While the magnetic susceptibility data indicates the presence of antiferromagnetic correlations in the system, the calculation of effective paramagnetic moment (μcal = 3.561 μB), assuming the metal oxidation states as obtained from XAS and the cation distribution as obtained from neutron refinement, is in agreement with the value obtained experimentally (μexp = 3.676 μB). © 2007 American Chemical Society.
Citation: Chemistry of Materials (2007), 19(25): 6158-6167
URI: https://doi.org/10.1021/cm071840g
http://repository.iitr.ac.in/handle/123456789/4026
Issue Date: 2007
ISSN: 8974756
Author Scopus IDs: 57200780613
55532574400
7003810844
35428678100
56242957000
7102535684
Author Affiliations: Mandal, T.K., Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, 610 Taylor Road, Piscataway, NJ 08854, United States
Abakumov, A.M., Department of Chemistry, Moscow State University, Moscow 119991, Russian Federation
Hadermann, J., Electron Microscopy for Materials Research (EMAT), University of Antwerp, Groenenborgerlaan 171, B-2020, Antwerp, Belgium
Van Tendeloo, G., Electron Microscopy for Materials Research (EMAT), University of Antwerp, Groenenborgerlaan 171, B-2020, Antwerp, Belgium
Croft, M., Department of Physics and Astronomy, Rutgers, The State University of New Jersey, 136 Frelinghuysen Road, Piscataway, NJ 08854, United States
Greenblatt, M., Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, 610 Taylor Road, Piscataway, NJ 08854, United States
Corresponding Author: Greenblatt, M.; Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, 610 Taylor Road, Piscataway, NJ 08854, United States; email: martha@rutchem.rutgers.edu
Appears in Collections:Journal Publications [CY]

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