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Study of the TiC{1-x} – TiO2 reactive interface

F. Réjasse 1 G. Trolliard 2, * J. Léchelle 3 O. Rapaud 1 O. Grauby 4 H. Khodja 5 Pierre Carles 6 
* Corresponding author
1 IRCER-AXE4 - IRCER - Axe 4 : céramiques sous contraintes environnementales
IRCER - Institut de Recherche sur les CERamiques : AXE4
2 IRCER-AXE3 - IRCER - Axe 3 : organisation structurale multiéchelle des matériaux
IRCER - Institut de Recherche sur les CERamiques : AXE3
3 LM2C - Laboratoire de Modélisation Multi-échelles des Combustibles
SESC - Service d'Etudes de Simulation du Comportement du combustibles : DEN/DEC/SESC
5 LEEL - UMR 3685 - Laboratoire d'Etudes des Eléments Légers
NIMBE UMR 3685 - Nanosciences et Innovation pour les Matériaux, la Biomédecine et l'Energie (ex SIS2M)
Abstract : The TiC1-x–TiO2 reactive interface obtained at 1100 °C has been studied by local structural investigations using Transmission Electron Microscopy (TEM) and X-rays microdiffraction. These results were completed by coupling complementary chemical characterizations by Nuclear Reaction Analysis (NRA), Rutherford Backscattering (RBS) and STEM (Scanning Transmission Electron Microscopy). A complex pattern of reactive interlayers of various thicknesses was formed as a result of the crossed redox reactions between TiO2 and TiC1-x. Our results show that the TiC1-x carbide is not oxidized by forming TiCxOy oxycarbides in spite of the complete solid solution existing between TiC1-x and TiO. TiC1-x is in fact destabilized by the oxygen liberated during the transformation of TiO2 into Magnéli type compounds (TinO2n-1) to form the most reduced Magnéli sub-oxides following the reaction: 3 TiCxOy + (5-3y)/2 O2 = Ti3O5 + 3x C. Starting from TiO2, a progressive reduction is achieved showing spatially distributed TinO2n-1 Magnéli phases characterized by high values of n close to TiO2 and lower values of n as reaching TiC1-x. The most reduced term is shown to be Ti3O5. Ti3O5 thus represents the final product of the reaction at 1100 °C both for the reaction of reduction of TiO2 and for the reaction of oxidation of TiC1-x.
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Submitted on : Thursday, January 11, 2018 - 2:11:43 PM
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F. Réjasse, G. Trolliard, J. Léchelle, O. Rapaud, O. Grauby, et al.. Study of the TiC{1-x} – TiO2 reactive interface. Acta Materialia, Elsevier, 2018, 146, pp.225-236. ⟨10.1016/j.actamat.2017.12.055⟩. ⟨cea-01681190⟩



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