Contribution à l'étude des propriétés de transport électronique de métaux et d'alliages métalliques à l'état liquide et solide au voisinage du point de fusion

Abstract : This work presents a contribution to the study of the electronic transport properties of metals and metallic alloys in the liquid state. We have measured the electrical resistivities of the systems nickel-antimony and nickel-germanium as a function of temperature and concentration. The interpretation of the experimental results was performed within the framework of the t-matrix formalism and by using the partial hard sphere structure factors. We have determined the absolute thermoelectric power (A.T. P.) of liquid germanium by applying four different kinds of cells, three of them having been deviced in the course of the this work. Furthermore, we have measured the A.T. P. of liquid germanium based alloys diluted by gallium. The esperimental results are confirmed by the calculations based on the Ashcroft E. C. P. potential combined with suitably adjusted parameters. The values deduced from the "first principale" potential of Animalu (S. M. P.) are systematically smaller in magnitude. The A.T. P. of solid germanium in the range of the melting point could be determined with an accuracy of 5-10 times better than that quoted in the literature, owing to a special experimental set-up and a technique which permitted to control the progression of the solidification. We have discussed the validity of the Wiedemann-Franz law (W-F) linking the electrical and the thermal conductivities. We have derived the thermal conductivity of several liquid metals and mettalic alloys from both the experimental and the calculated electrical resistivities. We have shown that, excepting may be the noble metals, the corrections of the W-F law give a negligible contribution. We have noted that the concentration dependance as well as the temperature coefficient of the thermal conductivity of aluminium-copper alloys show an anormalous behaviour. This phenomena must be confirmed by measuring the thermal conductivity
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Naïma Benazzi. Contribution à l'étude des propriétés de transport électronique de métaux et d'alliages métalliques à l'état liquide et solide au voisinage du point de fusion. Autre [cond-mat.other]. Université Paul Verlaine - Metz, 1991. Français. ⟨NNT : 1991METZ019S⟩. ⟨tel-01775943⟩

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