Electron Microscopical Investigations of Doped and Undoped Ba_0.5Sr_0.5Co_0.8Fe_0.2O_3-d for Oxygen Separation Membranes
Abstract:
Secondary phases and microstructure of Ba_0.5Sr_0.5Co_0.8Fe_0.2O_3-d (BSCF) were investigated by electron microscopy (TEM, SEM, EDXS, EELS) after annealing for 100 h at 700-1000 °C. Beside the cubic phase a hexagonal and a BaCoO phase were observed at grain boundaries and plate-like regions. A new evaluation method probing the Co-valence state based on EELS is described and was applied to determine the Co-valence in secondary phases. Furthermore CaCuO_2 thin-films were investigated.
| Zugehörige Institution(en) am KIT | Laboratorium für Elektronenmikroskopie (LEM) |
| Publikationstyp | Hochschulschrift |
| Publikationsjahr | 2013 |
| Sprache | Englisch |
| Identifikator | urn:nbn:de:swb:90-355010 KITopen-ID: 1000035501 |
| Verlag | Karlsruher Institut für Technologie (KIT) |
| Art der Arbeit | Dissertation |
| Fakultät | Fakultät für Physik (PHYSIK) |
| Institut | Laboratorium für Elektronenmikroskopie (LEM) |
| Prüfungsdaten | 31.05.2013 |
| Schlagwörter | Ba_.5Sr_.5Co_.8Fe_.2O_3-d (BSCF); Transmission Electron Microscopy (TEM); Electron Energy Loss Spectroscopy (EELS); CaCuO_2 (CCO); phase stability |
| Referent/Betreuer | Gerthsen, D. |