Published November 2004
| Version v1
Journal article
Synthesis, crystal and magnetic structure of a novel brownmillerite-type compound Ca2Co1.6Ga0.4O5
- 1. Department of Chemistry, Moscow State University, 119899 Moscow (Russian Federation)
- 2. Department of Materials Chemistry, Moscow State University, 119899 Moscow (Russian Federation)
- 3. Department of Structural Chemistry, Stockholm University, SE-10691 Stockholm (Sweden)
Description
The novel compound Ca2Co1.6Ga0.4O5 with brownmillerite (BM) structure has been prepared from citrates at 950oC. The crystal structure of Ca2Co1.6Ga0.4O5 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, χ2=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
Additional details
Identifiers
- DOI
- 10.1016/j.jssc.2004.08.018;
- PII
- S0022-4596(04)00458-X;
Publishing Information
- Journal Title
- Journal of Solid State Chemistry
- Journal Volume
- 177
- Journal Issue
- 11
- Journal Page Range
- p. 4251-4257
- ISSN
- 0022-4596
- CODEN
- JSSCBI
INIS
- Country of Publication
- United States
- Country of Input or Organization
- International Atomic Energy Agency (IAEA)
- INIS RN
- 36096981
- Subject category
- S36: MATERIALS SCIENCE;
- Descriptors DEI
- 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
- Descriptors DEC
- ALKALINE EARTH METAL COMPOUNDS; CHALCOGENIDES; COHERENT SCATTERING; CRYSTAL LATTICES; CRYSTAL STRUCTURE; DIFFRACTION; MAGNETISM; MICROSCOPY; OXYGEN COMPOUNDS; SCATTERING; SYMMETRY GROUPS; TEMPERATURE RANGE; TRANSITION ELEMENT COMPOUNDS
Optional Information
- Copyright
- Copyright (c) 2004 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.