Mise au point de dispositifs de mesure de conductivités et de propriétés thermoélectriques d'alliages métalliques liquides en environnement sévère

Abstract : The aim of this thesis is to develop rneasurernent devices able to characterize the thermoelectric properties and conductivities of liquid alloys under severe conditions of temperature and chemical reactivity. One does not know the thermal conductivity of the alloy lead/bismuth, which could be the liquid coolant and the neutron spallatlon source of the nuclear thermal power readors of fourth generation. We measured electric conductivity and thermoelectric power of this alloy on a broad range of temperature, with twelve different compositions. One deduced from it thermal conductivity according to the relations between the transport coefficients. In addition, the quasicristals have particular eletronic transport properties. A study of these alloys in the liquid state would be interesting. The principal experirnental difficulty is related to the chernical composition of quasicristals which are made of at least a very corrosive orchemically very active metal at the high temperatures of the liquids (aluminium, manganese, magnesium, rare eafihs ...). We developed new ceramic measurernent cells (alumina, boron nitride) able to resist the severe environmental conditions. These cells were tested within the framework of a study of ternary Mg39.5-Ga20.5-Zn40 which is a quasicristal in the solid state. The experirnental values of the various types of alloys were compared with computed values by using the Faber -Ziman frimalisrn and the theory of pseudopotentials.
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Frédéric Sar. Mise au point de dispositifs de mesure de conductivités et de propriétés thermoélectriques d'alliages métalliques liquides en environnement sévère. Autre [cond-mat.other]. Université Paul Verlaine - Metz, 2005. Français. ⟨NNT : 2005METZ002S⟩. ⟨tel-01752428⟩

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