Etude du pouvoir thermoélectrique absolu et de la résistivité de métaux et d'alliages de métaux nobles à l'état liquide

Abstract : This work has allowed to create a new automated device which measures simultaneously the resistivity and the absolute thermoelectric power of metals and alloys of metals in the liquid state. We have measured the electrical resistivity and the absolute thermoelectric power of liquid alloys of silver-gallium, silver-manganese, copper-manganese. The absolute thermopower of liquid alloys of silver-bismuth and copper-manganese-nickel have also been measured. A theorical interpretation is made, for the resistivity and the absolute thermoelectric power of liquid metals and liquid alloys, using the single site t matrix formulation and the energy dependence of phase shifts with the extended Faber-Ziman formula. The theoretical interpretation of absolute thermoelectric power have been made for the first time, at our knowledge, with an entire calculation taking into account the energy dependance. The results obtained how a better agreement with experience than the local calculation of absolute thermoelectric power. The computed results obtained for noble-polyvalent alloys are in better agreement with experience than those obtained for noble-transition alloys. The energy dependent phase shifts of manganese and the value of the Fermi energy of manganese don't give a good agreement between theory and experience
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Jean Vinckel. Etude du pouvoir thermoélectrique absolu et de la résistivité de métaux et d'alliages de métaux nobles à l'état liquide. Autre. Université Paul Verlaine - Metz, 1994. Français. ⟨NNT : 1994METZ045S⟩. ⟨tel-01776795⟩

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