| 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
Insights into the Mechanism Related to the Phase Transition from γ-Fe2O3 to α-Fe2O3 Nanoparticles Induced by Thermal Treatment and Laser Irradiation
Abstract
The nature of the physical mechanisms related to the gamma-Fe2O3 to alpha-Fe2O3 phase transition under laser irradiation and heat treatment has been investigated using in situ micro-Raman spectroscopy and X-ray powder diffraction (XRPD) analysis. Measurements were carried out on as-prepared gamma-Fe2O3 nanoparticles of about 4 nm in size as a function of laser power and on annealed gamma-Fe2O3 particles. Annealing temperature affects the relative fractions of the gamma-Fe2O3 and alpha-Fe2O3 phases, and at 450 degrees C, the phase transition into alpha-Fe2O3 becomes complete with apparent crystallite size < D > of about 30 nm. The hematite nanoparticles increase then up to more than 180 nm at 1400 degrees C. The excellent agreement between evolution of the wavenumbers and bandwidths confirms that the heat treatment and laser irradiation produces the same effects on nanoparticles. Correlations between structure modifications occurring at the nanometric scale during grain coalescence and the evolution of Raman vibrational spectra were quantitatively examined, and a physical mechanism for the gamma -> alpha-Fe2O3 phase transition was proposed.