| Autor: |
Valdez-Nava, Zarel, Cheballah, Chafé, Laudebat, L., Lebey, Thierry, Guillemet-Fritsch, S. |
| Přispěvatelé: |
Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Institut National Universitaire Champollion - INU (FRANCE), Centre Interuniversitaire de Recherche et d'Ingénierie des Matériaux - CIRIMAT (Toulouse, France), Pagès, Nathalie |
| Jazyk: |
angličtina |
| Rok vydání: |
2012 |
| Předmět: |
|
| Zdroj: |
Ingenierias. |
| ISSN: |
1405-0676 |
| Popis: |
CaCu3Ti4O12 (CCTO) is a material that presents a colossal dielectric constant (>105). In this work, CCTO was synthesized by chemical coprecipitation and sintered at 1050°C. Electrical properties were studied in bulk ceramic materials, as well as on individual grains and trough grain boundaries in alternative regime and continuous current. In AC regime, grains and grain boundaries show a resistive-like behavior. In DC regime local grain and grain boundary measurements do not allow determining the origin of the non-symmetric response in the bulk samples. It is finally found that non-ohmic contact between the heterogeneous ceramic and the electrodes could explain both the bulk and local electrical behaviors. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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