New Solid Electrolyte Na9Al(MoO4)6: Structure and Na+ Ion Conductivity

Aleksandra A. Savina, Vladimir A. Morozov, Anton L. Buzlukov, Irina Yu Arapova, Sergey Yu Stefanovich, Yana V. Baklanova, Tatiana A. Denisova, Nadezhda I. Medvedeva, Michel Bardet, Joke Hadermann, Bogdan I. Lazoryak, Elena G. Khaikina

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)

Abstract

Solid electrolytes are important materials with a wide range of technological applications. This work reports the crystal structure and electrical properties of a new solid electrolyte Na9Al(MoO4)6. The monoclinic Na9Al(MoO4)6 consists of isolated polyhedral [Al(MoO4)6]9- clusters composed of a central AlO6 octahedron sharing vertices with six MoO4 tetrahedra to form a three-dimensional framework. The AlO6 octahedron also shares edges with one Na1O6 octahedron and two Na2O6 octahedra. Na3-Na5 atoms are located in the framework cavities. The structure is related to that of sodium ion conductor II-Na3Fe2(AsO4)3. High-temperature conductivity measurements revealed that the conductivity (σ) of Na9Al(MoO4)6 at 803 K equals 1.63 × 10-2 S cm-1. The temperature behavior of the 23Na and 27Al nuclear magnetic resonance spectra and the spin-lattice relaxation rates of the 23Na nuclei indicate the presence of fast Na+ ion diffusion in the studied compound. At T<490 K, diffusion occurs by means of Na+ ion jumps exclusively through the sublattice of Na3-Na5 positions, whereas Na1 and Na2 become involved in the diffusion processes (through chemical exchange with the Na3-Na5 sublattice) only at higher temperatures.

Original languageEnglish
Pages (from-to)8901-8913
Number of pages13
JournalChemistry of Materials
Volume29
Issue number20
DOIs
Publication statusPublished - 24 Oct 2017
Externally publishedYes

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