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Please use this identifier to cite or link to this item: http://apo.ansto.gov.au/dspace/handle/10238/7323

Title: Synthesis and Characterization of the Crystal and Magnetic Structures and Properties of the Hydroxyfluorides Fe(OH)F and Co(OH)F
Authors: Yahia, HB
Shikano, M
Tabuchi, M
Kobayashi, H
Avdeev, M
Tan, TT
Liu, S
Ling, CD
Keywords: Lithium fluorides
Metals
X-ray sources
Crystal structure
Magnetic surfaces
Cobalt
Issue Date: 16-Dec-2013
Publisher: Americal Chemical Society
Citation: Hamdi, B. Y., Shikano, M., Tabuchi, M., Kobayashi, H., Avdeev, M., Tan, T. T., Liu, S., & Ling, C. D. (2014). Synthesis and characterization of the crystal and magnetic structures and properties of the hydroxyfluorides Fe(OH)F and Co(OH)F. Inorganic Chemistry, 53(1), 365-374. doi:10.1021/ic402294g
Abstract: The title compounds were synthesized by a hydrothermal route from a 1:1 molar ratio of lithium fluoride and transition-metal acetate in an excess of water. The crystal structures were determined using a combination of powder and/or single-crystal X-ray and neutron powder diffraction (NPD) measurements. The magnetic structure and properties of Co(OH)F were characterized by magnetic susceptibility and low-temperature NPD measurements. M(OH)F (M = Fe and Co) crystallizes with structures related to diaspore-type α-AlOOH, with the Pnma space group, Z = 4, a = 10.471(3) Å, b = 3.2059(10) Å, and c = 4.6977(14) Å and a = 10.2753(3) Å, b = 3.11813(7) Å, and c = 4.68437(14) Å for the iron and cobalt phases, respectively. The structures consist of double chains of edge-sharing M(F,O)6 octahedra running along the b axis. These infinite chains share corners and give rise to channels. The protons are located in the channels and form O–H···F bent hydrogen bonds. The magnetic susceptibility indicates an antiferromagnetic ordering at ∼40 K, and the NPD measurements at 3 K show that the ferromagnetic rutile-type chains with spins parallel to the short b axis are antiferromagnetically coupled to each other, similarly to the magnetic structure of goethite α-FeOOH. © 2014, American Chemical Society
URI: http://dx.doi.org/10.1021/ic402294g
http://apo.ansto.gov.au/dspace/handle/10238/7323
ISSN: 1520-510X
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