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Medientyp: E-Artikel; Sonstige Veröffentlichung Titel: Nanocrystalline versus microcrystalline Lo2O:B2O 3 composites: Anomalous ionic conductivities and percolation theory Beteiligte: Indris, Sylvio [VerfasserIn]; Heitjans, Paul [VerfasserIn]; Roman, H. Eduardo [VerfasserIn]; Bunde, Armin [VerfasserIn] Erschienen: College Park, ML : American Physical Society, 2000 Erschienen in: Physical Review Letters 84 (2000), Nr. 13 Ausgabe: published Version Sprache: Englisch DOI: https://doi.org/10.15488/2230; https://doi.org/10.1103/PhysRevLett.84.2889 Schlagwörter: Spectroscopic analysis ; Ion conductivities ; Percolation theory ; Grain boundaries ; Microcrystallines ; Electric conductivity ; Ion implantation ; Percolation (solid state) ; Conducting phases ; Grain size and shape ; X ray diffraction analysis ; Nanostructured materials ; Boron compounds ; Lithium compounds ; Differential thermal analysis Entstehung: Anmerkungen: Diese Datenquelle enthält auch Bestandsnachweise, die nicht zu einem Volltext führen. Beschreibung: 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. Zugangsstatus: Freier Zugang