Élaboration électrochimique et caractérisation de matériaux thermoélectriques de type (Bi1-xSbx)2Te3

Abstract : The objective of this work concerns the realization of thermoelectric materials by electrochemistry, for: applications related to their properties, which lie mainly in the field of the heat transfer. The expected materials are the p -type terrnary of the bismuth telluride family with antimony (Bi1-xSbx)2Te3. The first part of this work was devoted the choice of the chemical parameters making it possible to maintain the ion solubility, and to the analysis of the electrochemical behaviour of these species in solution. Then, a protocol of synthesis in continuous way was definedon stainless steel. It was possible to reach all Bi1-xSbx)2Te3 stoichiometries by varying the [Sb]/[Bi] ratio in solution. The optimal ratios allowing the Bi0,5Sb1,5.5Te3 formation, made up leading to the best thermoelectric properties at room temperature, were obtained for a potential range -0,15 and -0,3 V/SCE. Lastly, the relation between composition and conductivity was established. The definition of a synthesis protocol of these materials was also carried out in pulsed electrodeposition. Solutions of [Sb]/[Bi] ratios higher than employed in continuous way led to the electrodeposition of Bi1-xSbx)2Te3 composition ternary. The application of the pulsed deposition allowed a physical properties optimization of the deposits, in particular by strongly reducting the roughness. The determination of an adapted heat treatment protocol led to obtaining compounds with optimal thermoelectric properties.
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Doriane del Frari. Élaboration électrochimique et caractérisation de matériaux thermoélectriques de type (Bi1-xSbx)2Te3. Autre. Université Paul Verlaine - Metz, 2005. Français. ⟨NNT : 2005METZ010S⟩. ⟨tel-01752439⟩

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