Proprietes electroniques et electrogalvaniques du tellurure d'argent α domaine d'existence |
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Authors: | Gaston Bonnecaze Albert Lichanot Simon Gromb |
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Institution: | Institut Universitaire de Recherche Scientifique, Avenue Louis Sallenave, 64000 Pau, France;Université des Sciences et Techniques du Languedoc, Laboratoire de Chimie Physique, Place Eugène Bataillon, 34060 Montpellier, France |
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Abstract: | A study of the electronic and electrogalvanic properties of α silver telluride has been performed on samples whose non-stoiehiometry has been determined by coulometric titration with the cell Ag/AgI/Ag2Te/Pt. The data lead to the adoption of a model of Frenkel defects on the silver sublattice that are fully ionised. The homogeneity range is reported from 162 to 508°C: it extends essentially on the tellurium side of the stoichiometric composition. The free energies of formation of the α and β forms of the tellurides whose compositions are near Ag1,6Te, Ag1,9Te and Ag2,0Te have been determined between 23°C and 360°C. |
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