Synthesis, crystal and magnetic structure of a novel brownmillerite-type compound Ca{sub 2}Co{sub 1.6}Ga{sub 0.4}O{sub 5}

Istomin, S Ya; Abdyusheva, S V; Svensson, G; Antipov, E V

doi:10.1016/j.jssc.2004.08.018

Title: Synthesis, crystal and magnetic structure of a novel brownmillerite-type compound Ca{sub 2}Co{sub 1.6}Ga{sub 0.4}O{sub 5}

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Abstract

The novel compound Ca{sub 2}Co{sub 1.6}Ga{sub 0.4}O{sub 5} with brownmillerite (BM) structure has been prepared from citrates at 950{sup o}C. The crystal structure of Ca{sub 2}Co{sub 1.6}Ga{sub 0.4}O{sub 5} was refined, from neutron powder diffraction (NPD) data, in space group Pnma, a=5.3022(6)A, b=14.884(2)A, c=5.5276(6)A, {chi}2=1.798, RF2=0.0455, Rwp=0.0378 and Rp=0.0292. On the basis of the NPD refinement the compound was found to be a G-type antiferromagnet (space group Pn'm'a) at room temperature, with the magnetic moments of cobalt atoms directed along chains of tetrahedra in the BM structure. Electron diffraction and electron microscopy studies revealed disorder in the crystallites, which can be interpreted as the presence of slabs with BM-type structure of Pnma and I2mb symmetry.

Authors:

Istomin, S Ya ^[1]; Abdyusheva, S V ^[2]; Svensson, G ^[3]; Antipov, E V ^[1]

Department of Chemistry, Moscow State University, 119899 Moscow (Russian Federation)
Department of Materials Chemistry, Moscow State University, 119899 Moscow (Russian Federation)
Department of Structural Chemistry, Stockholm University, SE-10691 Stockholm (Sweden)

Publication Date:: Mon Nov 01 00:00:00 EST 2004

OSTI Identifier:: 20658204

Resource Type:: Journal Article

Journal Name:: Journal of Solid State Chemistry

Additional Journal Information:: Journal Volume: 177; Journal Issue: 11; Other Information: DOI: 10.1016/j.jssc.2004.08.018; PII: S0022-4596(04)00458-X; Copyright (c) 2004 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0022-4596

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; ANTIFERROMAGNETISM; CALCIUM COMPOUNDS; COBALT COMPOUNDS; CRYSTALS; ELECTRON DIFFRACTION; ELECTRON MICROSCOPY; MAGNETIC MOMENTS; NEUTRON DIFFRACTION; ORTHORHOMBIC LATTICES; OXIDES; SPACE GROUPS; SYMMETRY; SYNTHESIS; TEMPERATURE RANGE 0273-0400 K

Citation Formats


                    Istomin, S Ya, Abdyusheva, S V, Svensson, G, and Antipov, E V. Synthesis, crystal and magnetic structure of a novel brownmillerite-type compound Ca{sub 2}Co{sub 1.6}Ga{sub 0.4}O{sub 5}.  United States: N. p., 2004. 
        Web.  doi:10.1016/j.jssc.2004.08.018.

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                    Istomin, S Ya, Abdyusheva, S V, Svensson, G, & Antipov, E V. Synthesis, crystal and magnetic structure of a novel brownmillerite-type compound Ca{sub 2}Co{sub 1.6}Ga{sub 0.4}O{sub 5}.  United States.  https://doi.org/10.1016/j.jssc.2004.08.018

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                    Istomin, S Ya, Abdyusheva, S V, Svensson, G, and Antipov, E V. 2004.  
        "Synthesis, crystal and magnetic structure of a novel brownmillerite-type compound Ca{sub 2}Co{sub 1.6}Ga{sub 0.4}O{sub 5}".  United States.  https://doi.org/10.1016/j.jssc.2004.08.018.

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@article{osti_20658204,

  title        = {Synthesis, crystal and magnetic structure of a novel brownmillerite-type compound Ca{sub 2}Co{sub 1.6}Ga{sub 0.4}O{sub 5}},

  author       = {Istomin, S Ya and Abdyusheva, S V and Svensson, G and Antipov, E V},

  abstractNote = {The novel compound Ca{sub 2}Co{sub 1.6}Ga{sub 0.4}O{sub 5} with brownmillerite (BM) structure has been prepared from citrates at 950{sup o}C. The crystal structure of Ca{sub 2}Co{sub 1.6}Ga{sub 0.4}O{sub 5} was refined, from neutron powder diffraction (NPD) data, in space group Pnma, a=5.3022(6)A, b=14.884(2)A, c=5.5276(6)A, {chi}2=1.798, RF2=0.0455, Rwp=0.0378 and Rp=0.0292. On the basis of the NPD refinement the compound was found to be a G-type antiferromagnet (space group Pn'm'a) at room temperature, with the magnetic moments of cobalt atoms directed along chains of tetrahedra in the BM structure. Electron diffraction and electron microscopy studies revealed disorder in the crystallites, which can be interpreted as the presence of slabs with BM-type structure of Pnma and I2mb symmetry.},

  doi          = {10.1016/j.jssc.2004.08.018},

  url          = {https://www.osti.gov/biblio/20658204},
  journal      = {Journal of Solid State Chemistry},

  issn         = {0022-4596},

  number       = 11,

  volume       = 177,

  place        = {United States},

  year         = {Mon Nov 01 00:00:00 EST 2004},

  month        = {Mon Nov 01 00:00:00 EST 2004}

}

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