Анизотропия анионной проводимости в монокристаллах суперионного проводника CeF-=SUB=-3-=/SUB=-

The anisotropy of anionic conductivity in crystals of a superionic conductor CeF3 with the tysonite structure (sp. gr. P-3с1) has been studied for the first time. The conductivity measurements at temperatures from 300 K to 600 K were carried out along the principal a- and c-axes of trigonal unit cell of the crystal. The maximum value of electrical conductivity is observed along the c-axis. The superionic CeF3 crystals have the weak anisotropy of electrical conductivity equal to σ||c/σ||a = 2.4 and σ||c = 5.6 10–4 S/cm at 500 K. The anisotropy effect of anionic conductivity in individual fluorides with the tysonite structure is discussed in connection with the peculiarities of their atomic structure.

First transparent oxide ion conducting ceramics synthesized by full crystallization from glass

New transparent Ln1+xSr1−xGa3O7+δ (Eu/Gd/Tb) melilite ceramics, elaborated by full crystallization from glass, show anionic conductivity (>0.01 S cm−1 at 700 °C).

High Anionic Conductivity of Solids with Different Structure

Impedance spectroscopy data for a several materials with high ionic conductivity at the intermediate temperature range (296-473 K) were obtained and analyzed. Investigated systems including pure CsSb2F7, KSb2F7, related solid solutions Cs(1-x)KxSb2F7 (0.1≤x≤0.65) and some ionic materials with fluorite structure PbF2-BiF3-K[Na]F were studied. The values of the dc conductivity and activation energies are estimated from the analysis of the conductivity spectra. The role of cation substitution influencing on conductivity values, phase transitions and activation energies in the given systems have been discussed.