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

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Indris, S.; Heitjans, P.; Eduarde Roman, H.; Bunde, A.: Nanocrystalline versus microcrystalline Lo2O:B2O 3 composites: Anomalous ionic conductivities and percolation theory. In: Physical Review Letters 84 (2000), Nr. 13, 2889. DOI: https://doi.org/10.1103/PhysRevLett.84.2889

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Abstract: 
We study ionic transport in nano- and microcrystalline (1−x)Li2O: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 10μm), 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. © 2000 The American Physical Society.
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: 2000
Appears in Collections:Naturwissenschaftliche Fakultät

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pos. country downloads
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1 image of flag of Germany Germany 64 56.14%
2 image of flag of China China 19 16.67%
3 image of flag of United States United States 10 8.77%
4 image of flag of Netherlands Netherlands 4 3.51%
5 image of flag of Korea, Republic of Korea, Republic of 4 3.51%
6 image of flag of Canada Canada 4 3.51%
7 image of flag of India India 3 2.63%
8 image of flag of Japan Japan 2 1.75%
9 image of flag of Mexico Mexico 1 0.88%
10 image of flag of Spain Spain 1 0.88%
    other countries 2 1.75%

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