Abstract
The compound Na5Li3Ti2S8 has been synthesized by the reaction of Ti with a Na/Li/S flux at 723 K. Na5Li3Ti2S8 crystallizes in a new structure type with four formula units in space group C2/c of the monoclinic system. The structure contains three crystallographically independent Na+ cations and two crystallographically independent Li+ cations. Na5Li3Ti2S8 possesses a channel structure that features two-dimensional ∞2 [LiTiS43 -] layers built from Li(1)S4 and TiS4 tetrahedra. The layers, which are stacked along c, comprise eight-membered rings and sixteen-membered rings. Na(3)+ cations are located between the eight-membered rings and Na(1)+, Na(2)+, and Li(2)+ cations are located between the sixteen-membered rings. These cations are each octahedrally coordinated by six S2- anions. The ionic conductivity σT of Na5Li3Ti2S8 ranges from 8.8×10-6 S/cm at 303 K to 3.8×10-4 S/cm at 483 K. The activation energy Ea is 0.40 eV.
Original language | English (US) |
---|---|
Pages (from-to) | 837-841 |
Number of pages | 5 |
Journal | Journal of Solid State Chemistry |
Volume | 181 |
Issue number | 4 |
DOIs | |
State | Published - Apr 2008 |
Keywords
- Channel structure
- Ionic conductivity
- Sodium lithium titanium sulfide
- Synthesis
- X-ray structure
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Condensed Matter Physics
- Physical and Theoretical Chemistry
- Inorganic Chemistry
- Materials Chemistry