Academic literature on the topic 'Oxyde de néodyme'
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Dissertations / Theses on the topic "Oxyde de néodyme":
Tortosa, Karine. "Synthèse de composés à base de néodyme pour la polymérisation de l'ε-caprolactone et des oxiranes en milieu homogène et hétérogène." Lyon 1, 1999. http://www.theses.fr/1999LYO10323.
Steveler, Emilie. "Etude des mécanismes de photoluminescence dans les nitrures et oxydes de silicium dopés aux terres rares (Er, Nd)." Phd thesis, Université de Lorraine, 2012. http://tel.archives-ouvertes.fr/tel-00755571.
Tchiffo, Tameko Cyril. "Croissance et propriétés de couches minces d’oxydes pour microsources d’énergie." Thesis, Orléans, 2016. http://www.theses.fr/2016ORLE2068/document.
This thesis concerns the realization of oxide thin films and the study of their properties for photovoltaic or thermoelectric devices. In the first part, the TiOx properties are studied for use as an optically active transparent conductive oxide to put in front of the PV cells or, as optical coupling layer to interpose between the metal reflector and the absorbent layer of a PV cell. The layers are deposited by pulsed laser deposition (PLD). This method allows to get stoichiometric or oxygen deficient layers by controlling the oxygen partial pressure during the growth. The layers are doped with Nb to enhance electrical conductivity and/or with Nd for the conversion of Ultra-Violet photons to Near Infra-Red photons. Insulating and transparent layers, luminescent layers or conducting and absorbent layers are obtained. The TiO₁,₄₅₋₁,₆₀ films show polaronic or bipolaronic conductivity and exhibited the jump of electrical conductivity with jump height and temperature depending on the nature of the dopants. A second part of the manuscript concerns thermoelectricity in which the properties of cobalt calcium oxide are modulated for an efficient conversion of low temperature gradients centered at 300-365K. The control of the oxygen concentration of films allows to obtain the polymorphic phases CaxCoO₂,Ca₃Co₄O₉ and Ca₃Co₄O₆,₄₋₆,₈ having metallic or semiconducting behavior depending on the deposition temperature. The Ca₃Co₄O₆,₄₋₆,₈ films show high Seebeck coefficients (S) ≥ 1 000 μV/K and low electrical resistivity (3.8 to 6 mΩ.cm). Such interesting values have to be confirmed by additional experiments in order to be used as thermoelectric films
Hu, Hanyu. "Étude du système vitreux X2O3-NaPO3 (X = Al, B) et caractérisation par spectroscopies de résonance magnétique." Electronic Thesis or Diss., Université de Lille (2022-....), 2022. http://www.theses.fr/2022ULILR044.
This PhD focuses on the study of binary Al2O3-NaPO3, B2O3-NaPO3 and ternary Al2O3-B2O3-NaPO3 systems. The work is based on glass synthesis, Tg measurements and structural characterization by 1D/2D NMR. For the Al2O3-NaPO3 system, glasses have been prepared up to 35 mol% of Al2O3, Tg has shown a 3 domains-evolution explained by the presence of Q12Al sites and Al-O-Al bonds. For the B2O3-NaPO3 system, glasses have been prepared up to 70 mol% of B2O3, Tg has shown a 2 domains-evolution explained by the presence of Q12B sites and B-O-Bbonds. The vitrification domain of the Al2O3-B2O3-NaPO3 system has been determined for the first time and the Tg values have been related to the Al and B atoms coordination states. Some glass compositions have also been doped with Nd-oxide and analyzed by 1D/2D EPR technique
Steveler, Émilie. "Etude des mécanismes de photoluminescence dans les nitrures et oxydes de silicium dopés aux terres rares (Er, Nd)." Thesis, Université de Lorraine, 2012. http://www.theses.fr/2012LORR0109/document.
This thesis is devoted to the study of radiative transitions in rare-earth (Er, Nd) doped silicon oxide and silicon nitride thin films. The optical characterization of thin films prepared by thermal evaporation is based on photoluminescence spectroscopy. In this work, we investigate indirect excitation processes of Er3+ and Nd3+ ions in silicon based materials. In silicon nitride and silicon oxinitride, an energy transfer leading to the indirect excitation of Er3+ ions is demonstrated. For amorphous samples, the sensitization of Er3+ ions is attributed to localized electronic states in the matrix bandgap. For samples annealed at high temperature, silicon nanocrystals play a major role in the indirect excitation of erbium. In silicon oxide thin films, we evidences that both direct and indirect excitation processes of Nd3+ ions occur. For amorphous samples, indirect excitation occurs thanks to localized electronic states in the matrix bandgap. For samples annealed at temperatures above 1000 °C, silicon nanocrystals are sensitizers of Nd3+ ions. Results suggest that indirect excitation thank to localized states in the matrix bandgap could be more efficient than indirect excitation thanks to silicon nanocrystals
Poncelet, Olivier. "Précurseurs moléculaires d'oxydes de haute pureté : alcoxydes métallosiloxanes et bêta-dicétonate de lanthanides (yttrium, cérium, néodyme) d'aluminium et de zirconium : synthèse, caractérisation, valorisation." Nice, 1988. http://www.theses.fr/1988NICE4217.
Garnier, Nicolas. "Spectroscopie dans l'état excité des ions terres-rares Nd3+ et Tm3+ et fonctionnement laser multilongueur d'onde du YAG : Nd3+." Saint-Etienne, 1997. http://www.theses.fr/1997STET4020.
Savova, Bistra. "Étude du dopage de catalyseurs de déshydrogénation oxydante de l’éthane et du propane." Thesis, Lyon 1, 2009. http://www.theses.fr/2009LYO10341/document.
The oxidative dehydrogenations of propane and ethane have been studied on alkaline earth oxides doped with neodymium oxide (AEO) and nickel oxide doped with different metal oxides. Two types of synthesis have been compared for the preparation of AEO+Nd samples. The characterization by XRD showed the formation of solid solutions with different defects (cationic vacancies, dislocations). The formation of agglomerates of neodymium has also been observed. The catalytic testing showed that the presence of neodymium oxide increases both the conversion of propane and the selectivity to propylene. The addition of neodymium oxide increases the basicity of the catalysts, which seems to be beneficial to the selectivity. The nickel oxide based catalysts are very efficient in the oxidative dehydrogenation of ethane. The study shows that there is no formation of extended solid solution. The addition of niobium and oxalates anions leads to the isolation of the active O- sites at the surface of the nickel oxide, which decreases the activity but strongly increases the selectivity to ethylene. Furthermore, it modifies textural properties of nickel oxide increasing its specific surface area leading to better conversions. However, the applicability of this type of catalysts stays under question because of a deactivation that has been evidenced with time on stream. The characterization of the fresh and deactivated catalysts by XRD, Raman, XPS, TEM, EDX and TPD of O2 showed that this deactivation is due to the slow and irreversible reduction of Ni3+ cations leading to a further decrease in number of the O- species. The formation of NiNb2O6 phase during the deactivation has been evidenced