Abstract
A set of experiments is presented which allows one to obtain all the effects which appear as well in piezoelectric as in semiconducting and in semi-insulating materials connected with acoustoelectric amplifaction, using only a single sample of CdS: a) the sequence of current-steps, b) the various oscillation-modes associated with them, c) the part of the boundary conditions (contacts) in the onset of these phenomena. Two sets of phenomenaaccording to the size of the onset time τ and its change with the temperature are distinguished. The behaviour of these two sets of phenomena allowing the presence of one or two acoustic fluxes in the sample from different sources is explained. Nous presentons un ensemble d'experiences qui nous ont permis d'obtenir sur un měme echantillon de CdS tous les effets qui apparaissent dans un materiau piezoelectrique aussi bien semiconducteur que semi-isolant et qui sont lies a l'amplification acoustoelectrique: a) les succession des paliers de saturation du courant, b) les differents modes d'oscillations qui les accompagnent, c) le rǒle des conditions aux limites (contacts) sur l'apparition de ces phenomenes. Nous distinguons deux classes de phenomenes suivant la grandeur de leur temps d'incubation et son evolution avec la temperature. Nous expliquons les caracteristiques de ces deux classes en admettant la presence dans le materiau et suivant les circonstances d'un ou deux flux acoustiques de sources differentes.
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