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In Situ EXAFS Characterisation of the Synthesis of Polynuclear Chloroniobates from Sm Atom Reactions with Niobium Pentachloride

Abstract : A new method to prepare solid state chlorometallates by reductive dechlorination of solvated niobium pentachloride with vaporisation of nominally free atoms of samarium is described. Products were prepared in an original set-up by evaporation of samarium into a mixed toluene solution of NbCl5, at 180 K. The local order around the Nb atoms was probed by EXAFS spectroscopy at the Nb K edge, using an in situ cryostat coupled to the metal vapour oven, in order to better understand the condensation mechanisms. These in situ measurements confirm our previous ex situ EXAFS studies with solid state products obtained by Sm vaporisation : condensation of NbCl, by face-sharing octahedra.
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https://hal.archives-ouvertes.fr/jpa-00255196
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Submitted on : Wednesday, January 1, 1997 - 8:00:00 AM
Last modification on : Tuesday, November 16, 2021 - 9:56:13 AM
Long-term archiving on: : Thursday, May 20, 2010 - 8:42:40 PM

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C. den Auwer, M. Andrews, V. Briois, C. Cartier Dit Moulin, H. Dexpert. In Situ EXAFS Characterisation of the Synthesis of Polynuclear Chloroniobates from Sm Atom Reactions with Niobium Pentachloride. Journal de Physique IV Proceedings, EDP Sciences, 1997, 7 (C2), pp.C3-1051-C3-1056. ⟨10.1051/jp4:19972135⟩. ⟨jpa-00255196⟩

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