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Issue 13, 2004
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Li ion transport and interface percolation in nano- and microcrystalline composites

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Abstract

We use model calculations to study the ionic conductivity in micro- and nanocrystalline composites of the type (1 − x)Li2O∶xB2O3. Experimentally, such composites show a significant grain size effect. Microcrystalline samples (grain diameters in the range of some μm) show a strong monotonic decrease of the dc conductivity with increasing insulator content x, while nanocrystalline composites (grain sizes in the range of several nanometers) display a pronounced maximum in the conductivity at x ≈ 0.6. Above x = 0.9 the conductivity of the nanocrystalline materials drops sharply below the detection limit. We assume that neighbouring grains of conducting Li2O and insulating B2O3 are separated by a highly conducting interface with a constant thickness of about 1 nm, irrespective of the grain size. By using Monte Carlo simulations and percolation theory we show that the overall features of the ionic conductivity in both nano- and microcrystalline composites can be well described by a brick-layer type model that explicitly takes into account the different cross sectional areas for ionic transport between neighbouring Li2O grains, without additional free parameters involved.

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Publication details

The article was received on 09 Feb 2004, accepted on 16 Mar 2004 and first published on 18 May 2004


Article type: Paper
DOI: 10.1039/B401895H
Citation: Phys. Chem. Chem. Phys., 2004,006, 3680-3683
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    Li ion transport and interface percolation in nano- and microcrystalline composites

    M. Ulrich, A. Bunde, S. Indris and P. Heitjans, Phys. Chem. Chem. Phys., 2004, 006, 3680
    DOI: 10.1039/B401895H

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