Li+ Diffusion and its Structural Basis in the Nanocrystalline and Amorphous Forms of Two-dimensionally Ion-conducting LixTiS2

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dc.contributor.author Winter, Rudolf
dc.contributor.author Heitjans, Paul
dc.date.accessioned 2008-12-09T14:37:03Z
dc.date.available 2008-12-09T14:37:03Z
dc.date.issued 2001
dc.identifier.citation Winter , R & Heitjans , P 2001 , ' Li+ Diffusion and its Structural Basis in the Nanocrystalline and Amorphous Forms of Two-dimensionally Ion-conducting LixTiS2 ' Journal of Physical Chemistry B , vol 105 , no. 26 , pp. 6108-6115 . en
dc.identifier.issn 1520-6106
dc.identifier.other PURE: 89488
dc.identifier.other dspace: 2160/1487
dc.identifier.uri http://hdl.handle.net/2160/1487
dc.description Winter, Rudolf; Heitjans, P., (2001) 'Li+ Diffusion and its Structural Basis in the Nanocrystalline and Amorphous Forms of Two-dimensionally Ion-conducting LixTiS2', Journal of Physical Chemistry B 105(26) pp.6108-6115 RAE2008 en
dc.description.abstract The layered fast ion conductor LixTiS2 (x ≈ 2/3) has been prepared in nanocrystalline (n-LixTiS2) and amorphous (a-LixTiS2) forms. Hence, a direct comparison of the lithium diffusion in a homogeneously and a heterogeneously disordered material with the same composition is possible. As a reference system, polycrystalline LixTiS2 (in its hexagonal modification, h-LixTiS2) was also investigated by measuring the temperature and frequency dependencies of the spin−lattice relaxation rate T1-1 of 7Li. The activation energies for individually jumping ions as obtained from the low-temperature flanks of the rate maxima are 190, 160, and 70 meV in h-,n-, and a-LixTiS2, respectively. The frequency dependence of T1 is sublinear for both disordered forms, which is explained in terms of the unified site relaxation model. 7Li nuclear magnetic resonance (NMR) spectra of n-LixTiS2 tend, contrary to those of h-LixTiS2 and a-LixTiS2, to decompose into broad and narrow central line components. The relative intensity of the narrow component, which is attributed to fast moving Li ions in the interfacial regions, is temperature dependent and reaches 50% at 360 K. A schematic model for the ionic conduction process in two-dimensional nanocrystalline fast ionic conductors is proposed, introducing grain surface pathways as the dominant track for mobile ions. en
dc.format.extent 8 en
dc.language.iso eng
dc.relation.ispartof Journal of Physical Chemistry B en
dc.title Li+ Diffusion and its Structural Basis in the Nanocrystalline and Amorphous Forms of Two-dimensionally Ion-conducting LixTiS2 en
dc.type Text en
dc.type.publicationtype Article (Journal) en
dc.identifier.doi http://dx.doi.org/10.1021/jp011200f
dc.contributor.institution Institute of Mathematics & Physics (ADT) en
dc.contributor.institution Mathematics and Physics en
dc.description.status Peer reviewed en


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