Nanocrystalline versus microcrystalline Lo2O:B2O 3 composites: Anomalous ionic conductivities and percolation theory

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  • Istituto Nazionale di Fisica Nucleare (INFN)
  • Justus Liebig University Giessen
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Original languageEnglish
Article number2889
JournalPhysical review letters
Volume84
Issue number13
Publication statusPublished - 27 Mar 2000

Abstract

We study ionic transport in nano- and microcrystalline (1 - x)Li 2O:xB2O3 composites using standard impedance spectroscopy. In the nanocrystalline samples (average grain size of about 20 nm), the ionic conductivity σdc increases with increasing content x of B2O3 up to a maximum at x ≈ 0.5. Above x ≈ 0.92, σdc vanishes. By contrast, in the microcrystalline samples (grain size about 10 μm), σdc decreases monotonically with x and vanishes above x ≈ 0.55. We can explain this strikingly different behavior by a percolation model that assumes an enhanced conductivity at the interfaces between insulating and conducting phases in both materials and explicitly takes into account the different grain sizes.

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Nanocrystalline versus microcrystalline Lo2O:B2O 3 composites: Anomalous ionic conductivities and percolation theory. / Indris, Sylvio; Heitjans, Paul; Eduarde Roman, H. et al.
In: Physical review letters, Vol. 84, No. 13, 2889, 27.03.2000.

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abstract = "We study ionic transport in nano- and microcrystalline (1 - x)Li 2O:xB2O3 composites using standard impedance spectroscopy. In the nanocrystalline samples (average grain size of about 20 nm), the ionic conductivity σdc increases with increasing content x of B2O3 up to a maximum at x ≈ 0.5. Above x ≈ 0.92, σdc vanishes. By contrast, in the microcrystalline samples (grain size about 10 μm), σdc decreases monotonically with x and vanishes above x ≈ 0.55. We can explain this strikingly different behavior by a percolation model that assumes an enhanced conductivity at the interfaces between insulating and conducting phases in both materials and explicitly takes into account the different grain sizes.",
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T1 - Nanocrystalline versus microcrystalline Lo2O:B2O 3 composites

T2 - Anomalous ionic conductivities and percolation theory

AU - Indris, Sylvio

AU - Heitjans, Paul

AU - Eduarde Roman, H.

AU - Bunde, Armin

PY - 2000/3/27

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N2 - We study ionic transport in nano- and microcrystalline (1 - x)Li 2O:xB2O3 composites using standard impedance spectroscopy. In the nanocrystalline samples (average grain size of about 20 nm), the ionic conductivity σdc increases with increasing content x of B2O3 up to a maximum at x ≈ 0.5. Above x ≈ 0.92, σdc vanishes. By contrast, in the microcrystalline samples (grain size about 10 μm), σdc decreases monotonically with x and vanishes above x ≈ 0.55. We can explain this strikingly different behavior by a percolation model that assumes an enhanced conductivity at the interfaces between insulating and conducting phases in both materials and explicitly takes into account the different grain sizes.

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