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Main Title: LiBi3S5-A lithium bismuth sulfide with strong cation disorder
Author(s): Nakhal, Suliman
Wiedemann, Dennis
Stanje, Bernhard
Dolotko, Oleksandr
Wilkening, Martin
Lerch, Martin
Type: Article
Abstract: Among chalcogenide semiconductors for thermoelectric applications, alkali-metal bismuth compounds occur in many complex compositions favorable for high performance. Although LiBi3S5 had been announced in 1977, the potential 1D lithium-ion conductor has hitherto eluded selective synthesis and structure determination. In this study, we present a solid-state route to phase-pure LiBi3S5 powder starting from LiBiS2 and Bi2S3. Neutron diffractograms and lithium NMR spectra reveal its crystal structure to be a cation-disordered variety of the AgBi3S5 type (synthetic pavonite; monoclinic, C2/m). Topological analyses and lithium NMR relaxometry suggest that correlated lithium-ion diffusion with activation energies up to 0.66(2) eV occurs along the channels in b direction including tetrahedral voids. Because of cation disorder, immobile bismuth(III) ions clog these pathways, making LiBi3S5 a moderate to poor ionic conductor. The synthesis route reported is nonetheless promising for new lithium bismuth sulfides with, possibly ordered, structure types of the pavonite homologous series. (C) 2016 Elsevier Inc. All rights reserved.
Subject(s): lithium bismuth sulfide
crystal structure
neutron powder diffraction
topological analysis
lithium NMR
lithium diffusion pathways
Issue Date: 2016
Date Available: 13-Sep-2016
Language Code: en
DDC Class: 540 Chemie und zugeordnete Wissenschaften
Sponsor/Funder: DFG, FOR 1277, Mobilität von Lithiumionen in Festkörpern (molife)
Journal Title: Journal of solid state chemistry
Publisher: Elsevier
Volume: 238
Publisher DOI: 10.1016/j.jssc.2016.03.010
Page Start: 60
Page End: 67
EISSN: 1095-726X
ISSN: 0022-4596
TU Affiliation(s): Fak. 2 Mathematik und Naturwissenschaften » Inst. Chemie » FG Anorganische Chemie - Festkörper- und Materialchemie
Appears in Collections:Technische Universität Berlin » Publications

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