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Contribution à l'étude des propriétés structurales et de transport électronique des alliages métalliques liquides binaires et ternaires

Abstract : This work is in two parts. We first, study the electronic transport properties in the binary and ternary noble-noble and noble-noble-germanium liquid alloys. Then, we calculate the structure factors of binary and ternary Al-Ge an Al-Ni-Si liquid alloys. To interpret electronic transport properties of ternary liquid alloys, we developed a calculations of m-components liquid structure factors and electrical resistivity. We take square-well hard sphere effective potentials and t-matrix like form factor in the extended Faber-Ziman formula. Several binary and ternary liquid alloys present a prepeak in their structure factors. We show that the prepeak which characterize the chemical short-range order (CSRO) can be explained by the introduction of an attractive potential. This fact allowed us to explain the CSRO existing in the amorphisable compositions of Al-Ni-Si liquid alloys. Roll and Motz have obtained pronounced anomalies in the resistivity and in its temperature coefficient for noble-noble alloys. Several studies done in our laboratory (concerning noble-germanium alloys) have shown that the maximum of the resistivity is obtained with silver alloys. We first, have shown that our measurements do not reproduces the anomalies obtained by Roll and Motz. Secondly, we determine experimentally the electrical resistivity of ternary (Cu-Ag)-Ge and (Au-Ag)-Ge liquid alloys. We have calculated the resistivity of these ternary alloys. Some systematic trends (higher resistivity of Ag-Ge) of the experimental curves are not reproduced by an analysis in the conventional extension of Faber-Ziman (F-Z) formalism with the t-matrix. Among the possible explanations beyond the F-Z model, there is hydridization between s-(and/or p-) electrons with d-states
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Saïd Saadeddine. Contribution à l'étude des propriétés structurales et de transport électronique des alliages métalliques liquides binaires et ternaires. Matière Condensée [cond-mat]. Université Paul Verlaine - Metz, 1994. Français. ⟨NNT : 1994METZ020S⟩. ⟨tel-01776044⟩



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