| Autor: | Detlev Dr Hennings, Knuth Albertsen, Oliver Steigelmann |
|---|---|
| Rok vydání: | 1998 |
| Předmět: |
Materials science
Dopant Reducing atmosphere Inorganic chemistry Charge (physics) Dielectric Condensed Matter Physics Electrochemistry Electronic Optical and Magnetic Materials chemistry.chemical_compound chemistry Mechanics of Materials visual_art Barium titanate Materials Chemistry Ceramics and Composites visual_art.visual_art_medium Curie temperature Ceramic Electrical and Electronic Engineering |
| Zdroj: | Journal of Electroceramics. 2:193-198 |
| ISSN: | 1385-3449 |
| DOI: | 10.1023/a:1009926916939 |
| Popis: | BaTiO3 ceramics containing Mn acceptors and various Mo, W and Nb donor dopants have been fired in reducing atmosphere and re-oxidized in N2/O2. In single Mn-doped ceramics, Mn2+ is completely oxidized to Mn3+; in N2 containing 50 ppm O2 at T > 800°C. Changes of the Curie point and sample length under reduction and re-oxidation have been detected using dielectric and thermomechanical measurements. Charge compensation and complex formation between acceptors and donors have been observed. In donor-acceptor charge complexes, Mn2+ cannot be oxidized. |
| Databáze: | OpenAIRE |
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