10.15488/2230
Indris, Sylvio
Heitjans, Paul
Roman, H. Eduardo
Bunde, Armin
Nanocrystalline versus microcrystalline Lo2O:B2O 3 composites: Anomalous ionic conductivities and percolation theory
College Park, ML : American Physical Society
2000
Conducting phases
Ion conductivities
Microcrystallines
Percolation theory
Boron compounds
Differential thermal analysis
Electric conductivity
Grain boundaries
Grain size and shape
Ion implantation
Nanostructured materials
Percolation (solid state)
Spectroscopic analysis
X ray diffraction analysis
Lithium compounds
Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik
Technische Informationsbibliothek (TIB)
Technische Informationsbibliothek (TIB)
2017-11-10
2017-11-10
2000
eng
Article
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
http://www.repo.uni-hannover.de/handle/123456789/2256
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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.