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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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Chaboy, J.
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (7/7 displayed)
- 2016Effect of titania doping and sintering temperature on titanium local environment and electrical conductivity of YSZcitations
- 2014Structural determination of Bi-doped magnetite multifunctional nanoparticles for contrast imagingcitations
- 2014Structural determination of Bi-doped magnetite multifunctional nanoparticles for contrast imagingcitations
- 2014Relationships between structural and electrical properties in mixed conductors duplex materials in the ZrO2-Y2O3-TiO2 ternary systemcitations
- 2013XANES and EXAFS study of the local order in nanocrystalline yttria-stabilized zirconiacitations
- 2012Interfacial magnetic coupling between Fe nanoparticles in Fe-Ag granular alloyscitations
- 2010Ionic conductivity of nanocrystalline yttria-stabilized zirconiacitations
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article
Structural determination of Bi-doped magnetite multifunctional nanoparticles for contrast imaging
Abstract
<p>To determine with precision how Bi atoms are distributed in Bi-doped iron oxide nanoparticles their structural characterization has been carried out by X-ray absorption spectroscopy (XAS) recorded at the K edge of Fe and at the L<sub>3</sub> edge of Bi. The inorganic nanoparticles are nominally hybrid structures integrating an iron oxide core and a bismuth oxide shell. Fe K-edge XAS indicates the formation of a structurally ordered, non-stoichiometric magnetite (Fe<sub>3-δ</sub>O<sub>4</sub>) phase for all the nanoparticles. The XAS spectra show that, in the samples synthesized by precipitation in aqueous media and laser pyrolysis, the Bi atoms neither enter into the iron oxide spinel lattice nor form any other mixed Bi-Fe oxides. No modification of the local structure around the Fe atoms induced by the Bi atoms is observed at the Fe K edge. In addition, contrary to expectations, our results indicate that the Bi atoms do not form a well-defined Bi oxide structure. The XAS study at the Bi L<sub>3</sub> edge indicates that the environment around Bi atoms is highly disordered and only a first oxygen coordination shell is observed. Indefinite [BiO<sub>6-x</sub>(OH)<sub>x</sub>] units (isolated or aggregated forming tiny amorphous clusters) bonded through hydroxyl bridges to the nanoparticle, rather than a well defined Bi<sub>2</sub>O<sub>3</sub> shell, surround the nanoparticle. On the other hand, the XAS study indicates that, in the samples synthesized by thermal decomposition, the Bi atoms are embedded in a longer range ordered structure showing the first and second neighbors.</p>