693.932 PEOPLE
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| Naji, M. |
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| Petrov, R. H. | Madrid |
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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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article
Hot compaction of nanocrystalline TiO<sub>2</sub> (anatase) ceramics. Mechanisms of densification: Grain size and doping effects
Abstract
The hot compaction of nanocrystalline TiO<sub>2</sub> anatase powders is investigated using dilatometry. The constant rate of heating (CRH) method is applied to determine effective activation energies of the processes involved during sintering. Grain size and doping effects are studied, using dopant cations of different radius and charge: Zn<sup>2+</sup>, Al<sup>3+</sup>, Si<sup>4+</sup>, Nb<sup>5+</sup>. The results are interpreted by a mechanism including superplastic deformation and boundary diffusion. The former is predominant for small particles and low temperature, whereas the latter is more important for larger particles and higher temperature. Dopant effects on densification kinetics are discussed in view of defect chemistry.