Impedance spectroscopy of ultrafine-grain SnO2 ceramics with a variable grain size
| Autor: | Ludmila I. Ryabova, R. B. Vasil’ev, Alexander Gaskov, Sergey G. Dorofeev, Marina Rumyantseva |
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| Rok vydání: | 2006 |
| Předmět: |
Materials science
Analytical chemistry Conductivity Condensed Matter Physics Atomic and Molecular Physics and Optics Nanocrystalline material Grain size Electronic Optical and Magnetic Materials Dielectric spectroscopy Grain growth visual_art visual_art.visual_art_medium Grain boundary diffusion coefficient Grain boundary Ceramic |
| Zdroj: | Semiconductors. 40:104-107 |
| ISSN: | 1090-6479 1063-7826 |
| DOI: | 10.1134/s1063782606010180 |
| Popis: | The impedance spectra of nanocrystalline SnO2 ceramics with an average grain size d ranging from 3 to 43 nm were investigated in the frequency range 1–106 Hz at temperatures from 25 to 300°C in a dry oxygen atmosphere. Analysis of the experimental data by the graphoanalytical method made it possible to separate the contributions of grain bulk and grain boundaries to the conductivity. It is shown that the samples investigated can be arbitrarily divided into two groups with respect to the character of their conductivity. For the samples with an average grain size d < 25 nm, the charge transfer processes are almost completely determined by the grain boundaries. In samples with a larger grain size, the contribution of grain bulk to the conductivity is comparable with that of grain boundaries. |
| Databáze: | OpenAIRE |
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