| 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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Bouvier, Pierre
Institut Néel
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (24/24 displayed)
- 2023VO2 under hydrostatic pressure: Isostructural phase transition close to a critical end-pointcitations
- 2019Three-phase metal-insulator transition and structural alternative for a VO2 film epitaxially grown on Al2O3(0001)citations
- 2015High pressure single crystal x-ray and neutron powder diffraction study of the ferroelectric-paraelectric phase transition in PbTiO3citations
- 2014Jahn-Teller, Polarity, and Insulator-to-Metal Transition in BiMnO3 at High Pressurecitations
- 2012X-ray diffraction from stishovite under nonhydrostatic compression to 70 GPa: Strength and elasticity across the tetragonal → orthorhombic transitioncitations
- 2011High-pressure polarized Raman spectra of Gd(2)(MoO(4))(3): phase transitions and amorphizationcitations
- 2010Absence of pressure-induced amorphization in LiKSO4citations
- 2010Pressure-temperature phase diagram of SrTiO3 up to 53 GPacitations
- 2009Single crystal growth of BiMnO3 under high pressure-high temperature
- 2007Comparative study and imaging by PhotoElectroChemical techniques of oxide films thermally grown on zirconium and Zircaloy-4citations
- 2007Structural evolution of (Ca 0.35 Sr 0.65 )TiO 3 perovskite at high pressurescitations
- 2006Hot compaction of nanocrystalline TiO<sub>2</sub> (anatase) ceramics. Mechanisms of densification: Grain size and doping effectscitations
- 2006Raman scattering of the model multiferroic oxide BiFeO 3 : effect of temperature, pressure and stresscitations
- 2006Raman scattering of the model multiferroic oxide BiFeO<sub>3</sub>: effect of temperature, pressure and stresscitations
- 2006SnO 2 /MoO 3 -nanostructure and alcohol detectioncitations
- 2006Raman Imaging and Kelvin Probe Microscopy for the Examination of the Heterogeneity of Doping in Polycrystalline Boron-Doped Diamond Electrodes
- 2006Raman spectroscopy of Cs<SUB>2</SUB>HgBr<SUB>4</SUB> at high-pressure: effect of hydrostaticitycitations
- 2006Raman spectroscopy of Cs 2 HgBr 4 at high-pressure: effect of hydrostaticitycitations
- 2005The high-pressure structural phase transitions of sodium bismuth titanatecitations
- 2004Decomposition of LiGdF 4 scheelite at high pressurescitations
- 2003Quantification of Chemical Pressure in Doped Nanostructured Zirconia Ceramicscitations
- 2002X-ray diffraction study of WO 3 at high pressurecitations
- 2002X-ray diffraction study of WO<sub>3</sub> at high pressurecitations
- 2000Raman study of phases and stresses distributions in oxidation scales of Zirconim alloys: spectroscopic study of pressure and temperature effects on different nanometric Zirconia
Places of action
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thesis
Raman study of phases and stresses distributions in oxidation scales of Zirconim alloys: spectroscopic study of pressure and temperature effects on different nanometric Zirconia
Abstract
The present work is related to the study of oxidation mechanisms of Zirconim alloys entering into the fabrication of cooling system in nuclear plants. Different samples taken during oxidation in pure aor lithiated water under 180 bar and 360°C have been studied by Raman spectrometry. Stresses and phase distributions of tetragonal and monoclinic forms in the scale thickness have been determined and the pronounced correlation between the presence of a dense tetragonal phase in the neighbourhood of the metal/oxide interface with compressive stress state (2 GPa) has been observed. Different parameters such as stress gradients, phase concentrations and disorder ( in connection with crystallite size) have been quantified using data obtained on model samples represented by monoclinic and tetragonal Zirconia prepared by pyrosol technique, which allowed to obtain nanometric crystallite of determined size (between 7 and 18 nm), and submitted to controlled temperature (between -177 and 700°C) and pressure (between 1 atm and 20 GPa in diamond anvil cell). It is shown that the nanometric size is responsible for pronounced displacement of equilibrium line between phases in the p-T diagram of Zirconia (a 1000°C down shift is observed for crystallite size of 7 nm). Thus coupled effect of size and stresses are able to explain the stabilisation of the tetragonal form at the metal/oxide interface in oxidation layers. In parallel, the phases transition between the tetragonal and the cubic form observed under high pressure (40 GPa) has been modelled with the Landau theory of phase transition. The existence of an intermediate phase (D4h14) has been evidenced from Raman and x-rays diffraction experimental considerations.