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

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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

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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
License of this version: Es gilt deutsches Urheberrecht. Das Dokument darf zum eigenen Gebrauch kostenfrei genutzt, aber nicht im Internet bereitgestellt oder an Außenstehende weitergegeben werden.
Document Type: article
Publishing status: publishedVersion
Issue Date: 2005
Appears in Collections:Naturwissenschaftliche Fakultät

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pos. country downloads
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1 image of flag of Germany Germany 73 57.48%
2 image of flag of China China 9 7.09%
3 image of flag of United States United States 7 5.51%
4 image of flag of Japan Japan 6 4.72%
5 image of flag of Russian Federation Russian Federation 4 3.15%
6 image of flag of India India 4 3.15%
7 image of flag of Thailand Thailand 2 1.57%
8 image of flag of Korea, Republic of Korea, Republic of 2 1.57%
9 image of flag of Czech Republic Czech Republic 2 1.57%
10 image of flag of Brazil Brazil 2 1.57%
    other countries 16 12.60%

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