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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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Moore, Elaine
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (8/8 displayed)
- 2011Formation, cationic site exchange and surface structure of mechanosynthesized EuCrO<sub>3</sub> nanocrystalline particlescitations
- 2009The Formation of Nanocrystalline SrFeO3−δ Using Mechano-Synthesis and Subsequent Sintering: Structural and Mössbauer Studiescitations
- 2008Synthesis and structural investigation of a new oxide fluoride of composition Ba2SnO2.5F3·xH2O (x≈0.5)citations
- 2008Magnetic order in perovskite-related SrFeO<sub>2</sub>F
- 2007Iron(III) as a defect in diantimony tetroxidecitations
- 2002Tin-, titanium-, and magnesium-doped alpha-Cr2O3: characterisation and rationalisation of the structurescitations
- 2002Prediction of defect structure in lithiated tin- and titanium-doped alpha-Fe2O3 using atomistic simulationcitations
- 2001Investigation of defect structures formed by doping tetravalent ions into spinel-related iron oxides using atomistic simulation calculationscitations
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article
Formation, cationic site exchange and surface structure of mechanosynthesized EuCrO<sub>3</sub> nanocrystalline particles
Abstract
Nanocrystalline EuCrO<sub>3</sub> particles (~25 nm) have been prepared by pre-milling a 1 : 1 molar mixture of Eu<sub>2</sub>O<sub>3</sub> and Cr<sub>2</sub>O<sub>3</sub> for 60 h followed by sintering at 700°C (12 h). This temperature is ~500–600°C lower than those at which the material, in bulk form, is conventionally prepared. Rietveld analysis of the x-ray powder diffraction pattern of the EuCrO<sub>3</sub> nanoparticles favours a structural model involving a slight degree of cationic exchange where ~11% of the Eu<sup>3+</sup> and Cr<sup>3+</sup> ions exchange their normal dodecahedral A- and octahedral B-sites, respectively, in the perovskite-related structure. This cationic site exchange, which is unusual in a perovskite structure, has been well supported by the corresponding room-temperature <sup>151</sup>Eu Mössbauer spectrum of the nanoparticles that in addition to displaying a distribution in the principal component of the EFG tensor (V<sub>zz</sub>) at the usual A-sites of the <sup>151</sup>Eu nuclei, also revealed the presence of a subcomponent with ~11% area fraction and a considerably increased |V<sub>zz</sub>| value that was associated with Eu<sup>3+</sup> ions at octahedral B-sites. X-ray photoelectron and Auger electron spectroscopic techniques reveal a complex surface structure where extremely thin layers of un-reacted Eu<sub>2</sub>O<sub>3</sub> and Cr<sub>2</sub>O<sub>3</sub> cover most of the EuCrO<sub>3</sub> nanoparticles' surfaces together with some traces of elemental Cr. The binding energies associated with Eu<sup>3+</sup> 3d<sub>5/2</sub>, Eu<sup>3+</sup> 4d<sub>3/2</sub>, Cr<sup>3+</sup> 2p<sub>3/2</sub> and O<sup>2−</sup> 1s core-level electrons in EuCrO<sub>3</sub> are estimated from the x-ray photoelectron data for the first time.