Synthesis, structure, and ionic conductivity of Na{sub 5}Li{sub 3}Ti{sub 2}S{sub 8}

Journal Article · Tue Apr 15 04:00:00 EDT 2008 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2008.01.023· OSTI ID:21128254

Fuqiang, Huang ^[1]; Jiyong, Yao ^[2]; Zhanqiang, Liu; Jianghua, Yang ^[1]

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1. Shanghai Institute of Ceramics, 1295 Dingxi Road, Shanghai 200050 (China)
2. Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, IL 60208-3113 (United States)

The compound Na{sub 5}Li{sub 3}Ti{sub 2}S{sub 8} has been synthesized by the reaction of Ti with a Na/Li/S flux at 723 K. Na{sub 5}Li{sub 3}Ti{sub 2}S{sub 8} 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{sup +} cations and two crystallographically independent Li{sup +} cations. Na{sub 5}Li{sub 3}Ti{sub 2}S{sub 8} possesses a channel structure that features two-dimensional {sub {infinity}}{sup 2}[LiTiS{sub 4}{sup 3-}] layers built from Li(1)S{sub 4} and TiS{sub 4} tetrahedra. The layers, which are stacked along c, comprise eight-membered rings and sixteen-membered rings. Na(3){sup +} cations are located between the eight-membered rings and Na(1){sup +}, Na(2){sup +}, and Li(2){sup +} cations are located between the sixteen-membered rings. These cations are each octahedrally coordinated by six S{sup 2-} anions. The ionic conductivity {sigma}{sub T} of Na{sub 5}Li{sub 3}Ti{sub 2}S{sub 8} ranges from 8.8x10{sup -6} S/cm at 303 K to 3.8x10{sup -4} S/cm at 483 K. The activation energy E{sub a} is 0.40 eV. - Graphical abstract: The structure of Na{sub 5}Li{sub 3}Ti{sub 2}S{sub 8} viewed down [010]. For the sake of clarity, the Na-S and Li(2)-S interactions are omitted.

• OSTI ID: 21128254
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 4 Vol. 181; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
ACTIVATION ENERGY
CATIONS
IONIC CONDUCTIVITY
LAYERS
LITHIUM IONS
LITHIUM SULFIDES
MILLI EV RANGE
MONOCLINIC LATTICES
SODIUM IONS
SODIUM SULFIDES
SPACE GROUPS
SULFUR IONS
SYNTHESIS
TEMPERATURE RANGE 0273-0400 K
TEMPERATURE RANGE 0400-1000 K
TITANIUM SULFIDES
X RADIATION