Аннотация
The paper presents the studies of ionic and electronic Zeebeck coefficients and electronic conductivity in nonstoichiometric Ag 0.25–δ Cu 1.75 Se, Ag 1.2–δ Cu 0.8 Se solid solutions existing on the basis of the cubic phase of copper selenide. It is shown that Ag 1.2–δ Cu 0.8 Se is a bilateral variable composition phase manifesting inversion of the sign of predominant charge carriers under variation of the chemical composition by silver within the homogeneity region. Mobilities of electrons and electron holes are estimated on the basis of the concentration dependences.