Effect of the A-Site Substitution on the Structure Peculiarities and Ionic Conductivity of Solid Electrolytes

摘要

The effect of aliovalent substitution in the perovskite A-sublattice by Sr~(+2) ions on the structure peculiarities and ion transport in La_(2/3-x-y)Li_(3x-y)Sr_(2y)square_(4/3-2x)Nb_2O_6 (square-vacancy) has been studied. The peculiarities of phase formation in the systems studied are considered. The homogeneity region of Sr-containing solid solutions has been determined. It has been shown that the substitution of Sr~(+2) for (La~(+3) + Li~+) leads to an increase in perovskite lattice volume. The transport properties of Sr-containing lithium-conducting materials have been studied. It has been shown that substitution by larger ions contributes to higher ionic conductivity in the materials investigated.