DEMOURGUES, Alain; WATTIAUX, Alain

doi:10.1016/j.jfluchem.2011.04.005

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DEMOURGUES, Alain
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

WATTIAUX, Alain
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

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Journal of Fluorine Chemistry. 2011, vol. 132, n° 10, p. 690-697

Elsevier

Résumé en anglais

Well crystallized Fe-based oxyhydroxy-fluoride with the FeO(OH0.2F0.8)*0.2H2O chemical composition has been prepared from hydrolysis of Fe trifluoride under supercritical CO2 conditions. Investigation by Mössbauer spectroscopy and neutron diffraction show that this compound crystallize in the monoclinic symmetry (SG: I2/m, a = 10.447(7) Å, b = 3.028(2) Å, c = 10.445(4) Å, β = 90.00(3)°). Taking into account the Fe-O(F) bond distances, F− anions are mainly located on the common vertices of Fe octahedra whereas OH− groups occupy mainly the shared edges of the Fe octahedra. Two various highly distorted octahedral sites have been identified with Fe-O/F bond distances varying from 1.90 Å to 2.31 Å. One Fe site is more distorted than in FeO0.8OH1.2*0.2Cl akaganeite because of the random distribution of F−/OH−/O2− in the vicinity of this Fe cation.< Réduire

Mots clés

Akaganeite

Hollandite

Iron

Oxyhydroxyfluorides

Structure determination

Powder neutron diffraction

Mössbauer spectroscopy

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Investigation of Fe-based oxyhydroxy-fluoride with hollandite-type structure

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