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
Zusammenfassung: |
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.
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Publikationstyp: |
Article |
Publikationsstatus: |
publishedVersion |
Erstveröffentlichung: |
2000 |
Schlagwörter (englisch): |
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
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Fachliche Zuordnung (DDC): |
530 | Physik
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