| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Grenèche, Jean-Marc
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (15/15 displayed)
- 2023Influence of Nd Substitution on the Phase Constitution in (Zr,Ce)Fe10Si2 Alloys with the ThMn12 Structurecitations
- 2018Exchange-Biased Fe 3− x O 4 -CoO Granular Composites of Different Morphologies Prepared by Seed-Mediated Growth in Polyol: From Core-Shell to Multicore Embedded Structurescitations
- 2017Atomic scale modeling of iron-doped biphasic calcium phosphate bioceramicscitations
- 2016Structural behavior of laser-irradiated γ-Fe 2 O 3 nanocrystals dispersed in porous silica matrix : γ-Fe 2 O 3 to α-Fe 2 O 3 phase transition and formation of ε-Fe 2 O 3citations
- 2016New iron tetrazolate frameworks : synthesis temperature effect, thermal behaviour, Mössbauer and magnetic studiescitations
- 2015Structural investigations of iron oxynitride multilayered films obtained by reactive gas pulsing processcitations
- 2015New iron tetrazolate frameworkscitations
- 2015New iron tetrazolate frameworks:synthesis temperature effect, thermal behaviour, Mössbauer and magnetic studiescitations
- 2014Magnetic Iron Oxide Nanoparticles: Reproducible Tuning of the Size and Nanosized-Dependent Composition, Defects, and Spin Cantingcitations
- 2014Exchange-biased oxide-based core-shell nanoparticles produced by seed-mediated growth in polyolcitations
- 2013Isomorphous Substitution in a Flexible Metal–Organic Framework: Mixed-Metal, Mixed-Valent MIL-53 Type Materialscitations
- 2012Insights into the Mechanism Related to the Phase Transition from γ-Fe2O3 to α-Fe2O3 Nanoparticles Induced by Thermal Treatment and Laser Irradiationcitations
- 2012Development of new anodes compatible with the solid oxide fuel cell electrolyte BaIn0.3Ti0.7O2.85citations
- 2004The titration of clay minerals I. Discontinuous backtitration technique combined with CEC measurements.citations
- 2000Microstructural and magnetic properties of Fe/Cr-substituted ferrite compositescitations
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article
Isomorphous Substitution in a Flexible Metal–Organic Framework: Mixed-Metal, Mixed-Valent MIL-53 Type Materials
Abstract
Mixed-metal iron–vanadium analogues of the 1,4-benzenedicarboxylate (BDC) metal–organic framework MIL-53 have been synthesized solvothermally in N,N′-dimethylformamide (DMF) from metal chlorides using initial Fe:V ratios of 2:1 and 1:1. At 200 °C and short reaction time (1 h), materials (Fe,V)II/IIIBDC(DMF1–xFx) crystallize directly, whereas the use of longer reaction times (3 days) at 170 °C yields phases of composition [(Fe,V)III0.5(Fe,V)0.5II(BDC)(OH,F)]0.5–·0.5DMA+ (DMA = dimethylammonium). The identity of the materials is confirmed using high-resolution powder X-ray diffraction, with refined unit cell parameters compared to known pure iron analogues of the same phases. The oxidation states of iron and vanadium in all samples are verified using X-ray absorption near edge structure (XANES) spectroscopy at the metal K-edges. This shows that in the two sets of materials each of the vanadium and the iron centers are present in both +2 and +3 oxidation states. The local environment and oxidation state of iron is confirmed by 57Fe Mössbauer spectrometry. Infrared and Raman spectroscopies as a function of temperature allowed the conditions for removal of extra-framework species to be identified, and the evolution of μ2-hydroxyls to be monitored. Thus calcination of the mixed-valent, mixed-metal phases [(Fe,V)III0.5(Fe,V)0.5II(BDC)(OH,F)]0.5–·0.5DMA+ yields single-phase MIL-53-type materials, (Fe,V)III(BDC)(OH,F). The iron-rich, mixed-metal MIL-53 shows structural flexibility that is distinct from either the pure Fe material or the pure V material, with a thermally induced pore opening upon heating that is reversible upon cooling. In contrast, the material with a Fe:V content of 1:1 shows an irreversible expansion upon heating, akin to the pure vanadium analogue, suggesting the presence of some domains of vanadium-rich regions that can be permanently oxidized to V(IV).