Synthesis and characterization of the crystal structure and magnetic properties of the hydroxyfluoride MnF2-x(OH)x (x similar to 0.8)
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Date
2013-01-01
Journal Title
Journal ISSN
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Publisher
Royal Society of Chemistry
Abstract
The new compound MnF2-x(OH)(x) (x similar to 0.8) was synthesized by a hydrothermal route from a 1 : 1 molar ratio of lithium fluoride and manganese acetate in an excess of water. The crystal structure was determined using the combination of single crystal X-ray and neutron powder diffraction measurements. The magnetic properties of the title compound were characterized by magnetic susceptibility and low-temperature neutron powder diffraction measurements. MnF2-x(OH)(x) (x similar to 0.8) crystallizes with orthorhombic symmetry, space group Pnn2 (no. 34), a = 4.7127(18), b = 5.203(2), c = 3.2439(13) angstrom, V = 79.54(5) angstrom(3) and Z = 2. The crystal structure is a distorted rutile-type with [Mn(F,O)(4)] infinite edge-sharing chains along the c-direction. The protons are located in the channels and form O-H center dot center dot center dot F bent hydrogen bonds. The magnetic susceptibility measurements indicate an antiferromagnetic ordering at similar to 70 K and the neutron powder diffraction measurements at 3 K show that the ferromagnetic chains with spins parallel to the c-axis are antiferromagnetically coupled to each other, similarly to the magnetic structure of tetragonal rutile-type MnF2 with isoelectronic Mn2+. MnF2-x(OH)(x) (x similar to 0.8) is expected to be of great interest as a positive electrode for Li cells if the protons could be exchanged for lithium. © 2013, Royal Society of Chemistry.
Description
Keywords
Rutile, Pressure range mega pa 10-100, Neutrons, Neutron diffraction, Diffraction, Lithium
Citation
Ben Yahia, H., Shikano, M., Kobayashi, H., Avdeev, M., Liu, S., & Ling, C. D. (2013). Synthesis and characterization of the crystal structure and magnetic properties of the hydroxyfluoride MnF2-x(OH)x (x similar to 0.8). Physical Chemistry Chemical Physics, 15(31), 13061-13069. doi:10.1039/C3CP50740H