Details
| Original language | English |
|---|---|
| Pages (from-to) | 3680-3683 |
| Number of pages | 4 |
| Journal | Physical Chemistry Chemical Physics |
| Volume | 6 |
| Issue number | 13 |
| Publication status | Published - 7 Jul 2004 |
Abstract
We use model calculations to study the ionic conductivity in micro- and nanocrystalline composites of the type (1 - x)Li2O:xB 2O3. Experimentally, such composites show a significant grain size effect. Microcrystalline samples (grain diameters in the range of some μm) show a strong monotonie 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 B 2O3 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 Li 2O grains, without additional free parameters involved.
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In: Physical Chemistry Chemical Physics, Vol. 6, No. 13, 07.07.2004, p. 3680-3683.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Li ion transport and interface percolation in nano- and microcrystalline composites
AU - Ulrich, Markus
AU - Bunde, Armin
AU - Indris, Sylvio
AU - Heitjans, Paul
PY - 2004/7/7
Y1 - 2004/7/7
N2 - We use model calculations to study the ionic conductivity in micro- and nanocrystalline composites of the type (1 - x)Li2O:xB 2O3. Experimentally, such composites show a significant grain size effect. Microcrystalline samples (grain diameters in the range of some μm) show a strong monotonie 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 B 2O3 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 Li 2O grains, without additional free parameters involved.
AB - We use model calculations to study the ionic conductivity in micro- and nanocrystalline composites of the type (1 - x)Li2O:xB 2O3. Experimentally, such composites show a significant grain size effect. Microcrystalline samples (grain diameters in the range of some μm) show a strong monotonie 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 B 2O3 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 Li 2O grains, without additional free parameters involved.
UR - http://www.scopus.com/inward/record.url?scp=4043067106&partnerID=8YFLogxK
U2 - 10.1039/b401895h
DO - 10.1039/b401895h
M3 - Article
AN - SCOPUS:4043067106
VL - 6
SP - 3680
EP - 3683
JO - Physical Chemistry Chemical Physics
JF - Physical Chemistry Chemical Physics
SN - 1463-9076
IS - 13
ER -