Jump to main content
Jump to site search

Issue 13, 2004
Previous Article Next Article

Li ion transport and interface percolation in nano- and microcrystalline composites

Author affiliations


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.

Back to tab navigation

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

  •   Request permissions

    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

Search articles by author