AC and DC Conductivity in Nano- and Microcrystalline Li2O : B2O3 Composites: Experimental Results and Theoretical Models

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dc.identifier.uri http://dx.doi.org/10.15488/2265
dc.identifier.uri http://www.repo.uni-hannover.de/handle/123456789/2291
dc.contributor.author Indris, Sylvio
dc.contributor.author Heitjans, Paul
dc.contributor.author Ulrich, Markus
dc.contributor.author Bunde, Armin
dc.date.accessioned 2017-11-10T18:14:25Z
dc.date.available 2017-11-10T18:14:25Z
dc.date.issued 2005
dc.identifier.citation Indris, S.; Heitjans, P.; Ulrich, M.; Bunde, A.: AC and DC Conductivity in Nano- and Microcrystalline Li2O : B2O3 Composites: Experimental Results and Theoretical Models. In: Zeitschrift für Physikalische Chemie 219 (2005), Nr. 38353, S. 89-103. DOI: https://doi.org/10.1524/zpch.219.1.89.55015
dc.description.abstract We report on impedance measurements of nano- and microcrystalline composites of the Li ion conductor Li2O and the ionic insulator B2O3 as well as their interpretation in the frame of percolation models. In the experimental part, besides the dc conductivity and its dependence on composition and temperature (i.e. its activation energy) also the ac conductivity and its dependence on composition, temperature and frequency (i.e. the conductivity exponent) are presented. Striking differences between the nanocrystalline and the corresponding microcrystalline composites were found. Deviations of the ac from the dc results can be explained by the fact that the experiments probe ion dynamics on different time and thus length scales. In the theoretical part, a continuum percolation model, a brick-layer type bond percolation approach and a Voronoi construction are alternatively used to model the dc behaviour. Based merely on the largely different volume fractions of the interfaces between ionic conductor and insulator grains in the nano- and microcrystalline composites, good overall agreement with the experimental dc results is obtained. The high critical insulator content above which the experimental conductivity vanishes in the nanocrystalline composites suggests the presence of an additional Li diffusion passageway of nanometer length in the interface between nanocrystalline insulator grains. © 2005, Oldenbourg Wissenschaftsverlag GmbH eng
dc.language.iso eng
dc.publisher Berlin : Walter de Gruyter
dc.relation.ispartofseries Zeitschrift für Physikalische Chemie 219 (2005), Nr. 38353
dc.rights Es gilt deutsches Urheberrecht. Das Dokument darf zum eigenen Gebrauch kostenfrei genutzt, aber nicht im Internet bereitgestellt oder an Außenstehende weitergegeben werden.
dc.subject alternating current eng
dc.subject article eng
dc.subject chemical composition eng
dc.subject composite material eng
dc.subject direct current eng
dc.subject electric activity eng
dc.subject electric conductivity eng
dc.subject ion conductance eng
dc.subject molecular dynamics eng
dc.subject molecular interaction eng
dc.subject nanoparticle eng
dc.subject temperature dependence eng
dc.subject theoretical model eng
dc.subject.ddc 540 | Chemie ger
dc.subject.ddc 530 | Physik ger
dc.title AC and DC Conductivity in Nano- and Microcrystalline Li2O : B2O3 Composites: Experimental Results and Theoretical Models eng
dc.type article
dc.type Text
dc.relation.issn 09429352
dc.relation.doi https://doi.org/10.1524/zpch.219.1.89.55015
dc.bibliographicCitation.issue 38353
dc.bibliographicCitation.volume 219
dc.bibliographicCitation.firstPage 89
dc.bibliographicCitation.lastPage 103
dc.description.version publishedVersion
tib.accessRights frei zug�nglich


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