| Popis: |
In two-dimensional superionic conductors the crystal structure, ionic conductivity and diffusion processes have been studied taking systems of two types. The first type of Cu 1+y CrSe 2 system is a variable composition phase with an extension of the homogeneity region y = 0−0.04. The second type of compounds represents intercalated systems, particularly niobium dichalcogenide intercalated by silver Ag, NbSe 2 within a composition range 0 x ⩽ 0.75. Copper chromium chalcogenide of a stoichiometric composition has been shown to undergo a second-order phase transition at (190 ± 10)°C. the phase transition is connected with the complete disorder of copper ions in a rigid sublattice formed by chrome and selenium ions. The development of superstructures due to the ordering of the intercalated silver atoms has been found for Ag, NbSe 2 at x = 0.33 and 0.67. For the systems studied, the ionic conductivity and chemical diffusion coefficient values have been estimated in the monophase condition region. |
