The thermally induced transformation of pseudoboehmite gels - a comparison of the effects of corundum seeding and iron doping
- The transformation of doped or seeded pseudoboehmite to corundum was studied by combining thermal analysis, X-ray diffraction, transmission electron microscopy, and electron paramagnetic resonance spectroscopy. The temperature of phase transformation to corundum was lowered by about 130 °C when Fe3+ or corundum seeds were added to the sols. Action of Fe3+ ions depends on the actual degree of thermally induced transformation of pseudoboehmite via transition aluminas to corundum and the ability of these alumina phases to incorporate Fe3+ ions. These ions tend to aggregate with increasing iron concentration of the alumina phases and can work as nucleation centers. Small (not, vert, similar20 nm) corundum particles act as active nucleation sites whereas larger grains (200400 nm) also present in the samples are less effective. For the first time trapping and stabilization of NO2 molecules in transition aluminas formed by a solgel route was shown.
Autor*innen: | Marianne NofzORCiD, R. Stösser, G. Scholz, Ilona Dörfel, Dietrich Schultze |
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Dokumenttyp: | Zeitschriftenartikel |
Veröffentlichungsform: | Verlagsliteratur |
Sprache: | Englisch |
Titel des übergeordneten Werkes (Englisch): | Journal of the European Ceramic Society |
Jahr der Erstveröffentlichung: | 2005 |
Herausgeber (Institution): | European Ceramic Society |
Verlag: | Elsevier |
Verlagsort: | Oxford |
Jahrgang/Band: | 25 |
Ausgabe/Heft: | 7 |
Erste Seite: | 1095 |
Letzte Seite: | 1107 |
Freie Schlagwörter: | Al2O3; Electron microscopy; Grain size; Sol-gel processes; X-ray methods |
DOI: | 10.1016/j.jeurceramsoc.2004.04.014 |
ISSN: | 0955-2219 |
ISSN: | 1873-619X |
Verfügbarkeit des Dokuments: | Physisches Exemplar in der Bibliothek der BAM vorhanden ("Hardcopy Access") |
Bibliotheksstandort: | Sonderstandort: Publica-Schrank |
Datum der Freischaltung: | 19.02.2016 |
Referierte Publikation: | Ja |
Datum der Eintragung als referierte Publikation: | 30.05.2005 |