Reference : Crystal chemistry and polymorphism of an iron-tungsten mixed oxide
Scientific congresses and symposiums : Unpublished conference/Abstract
Physical, chemical, mathematical & earth Sciences : Chemistry
http://hdl.handle.net/2268/230236
Crystal chemistry and polymorphism of an iron-tungsten mixed oxide
English
[fr] Cristallochimie et polymorphisme d'un oxyde mixte fer-tungstène
Caubergh, Stéphane mailto [Université de Liège - ULiège > Département de chimie (sciences) > Chimie inorganique structurale >]
Jungers, Thomas mailto [Université de Liège - ULiège > Département de chimie (sciences) > Chimie inorganique structurale >]
Mahmoud, Abdelfattah mailto [Université de Liège - ULiège > Département de chimie (sciences) > LCIS - GreenMAT >]
Boschini, Frédéric mailto [Université de Liège - ULiège > > Plateforme APTIS >]
Matsubara, Nami mailto [Université de Caen Basse-Normandie > > Crismat > >]
Martin, Christine mailto [Université de Caen Basse-Normandie > > Crismat > >]
Vertruyen, Bénédicte mailto [Université de Liège - ULiège > Département de chimie (sciences) > Chimie inorganique structurale >]
13-Dec-2018
No
No
National
Annual Meeting of the BCerS 2018
December 13, 2018
Belgian Ceramic Society
Liège
Belgique
[en] Polymorphism ; Crystal structures ; Spray-drying ; Synthesis ; inorganic chemistry ; Mossbauer ; Synchrotron ; Structure resolution ; Rietveld
[en] Iron tungstate Fe2WO6 attracts increasing interest in two areas of applications due to its photoelectrochemical behaviour. Fe2WO6 is studied either as a photocatalyst for degradation of environmental pollutants or as a photoanode for water oxidation in tandem devices. Recently, some of its magneto-dielectric properties have been reported but its magnetic and electric properties remain nebulous. Indeed, Fe2WO6 iron tungstate exists as two or three crystal structures with different organizations of the FeO6 and WO6 octahedra. The conditions of polymorphism are still unclear: structures were reported in the literature for only two of the three polymorphs (α and γ) and very little is known about the third polymorph (β).
In the present work, we could synthesize for the first time a complete set of the three polymorphs as single-phase products by spray-drying, thereby confirming the existence of the β-polymorph. We revised the structural model for the α-polymorph and solved the structure of the β-polymorph. The new procedure of synthesis also allowed us to control and tune the Fe/W ratio and investigate the possibility for a solid solution domain. The final products were characterized by means of X-Ray Diffraction (synchrotron data), Rietveld refinement, Scanning Electron Microscopy and 57Fe Mossbauer spectroscopy.
Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS ; Fonds pour la formation à la Recherche dans l'Industrie et dans l'Agriculture (Communauté française de Belgique) - FRIA
Etude de la cristallochimie et des propriétés photo-électrochimiques d'un oxyde de fer et de tungstène
Researchers ; Professionals
http://hdl.handle.net/2268/230236

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