Effect of the A-Site Substitution on the Structure Peculiarities and Ionic Conductivity of Solid Electrolytes La_2/3−x−yLi_3x−ySr_2y□_4/3−2xNb₂O₆

O. N. Gavrilenko V. I. Vernadskii Institute of General and Inorganic Chemistry, Kyiv, UkraineCorrespondence[email protected]

A. G. Belous V. I. Vernadskii Institute of General and Inorganic Chemistry, Kyiv, Ukraine

L. L. Kovalenko V. I. Vernadskii Institute of General and Inorganic Chemistry, Kyiv, Ukraine

Ye. V. Pashkova V. I. Vernadskii Institute of General and Inorganic Chemistry, Kyiv, Ukraine

Abstract

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−yLi_3x−ySr_2y□_4/3−2xNb₂O₆ (□-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.

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Effect of the A-Site Substitution on the Structure Peculiarities and Ionic Conductivity of Solid Electrolytes La_2/3−x−yLi_3x−ySr_2y□_4/3−2xNb₂O₆

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Effect of the A-Site Substitution on the Structure Peculiarities and Ionic Conductivity of Solid Electrolytes La2/3−x−yLi3x−ySr2y□4/3−2xNb2O6

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Effect of the A-Site Substitution on the Structure Peculiarities and Ionic Conductivity of Solid Electrolytes La_2/3−x−yLi_3x−ySr_2y□_4/3−2xNb₂O₆