Fielitz, Peter und Ganschow, Steffen und Borchardt, Günter und Kelm, Klemens (2020) Self-diffusion in high-purity a-Al2O3: Comparison of Ti-doped, Mg-doped and undoped single crystals. Journal of the European Ceramic Society, 41, Seiten 663-668. Elsevier. doi: 10.1016/j.jeurceramsoc.2020.07.064. ISSN 0955-2219.
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Offizielle URL: https://www.sciencedirect.com/journal/journal-of-the-european-ceramic-society/vol/41/issue/1
Kurzfassung
Oxygen diffusivity in α-alumina is characterised by a scatter band of about one decade and a half in an Arrhenius diagram. In order to control decisive material parameters the present study is based on high-purity single crystals which were deliberately doped with aliovalent elements (Mg or Ti) and simultaneously annealed in an 18O2 atmosphere (200 mbar at 1650 °C). In such a crucial experiment the diffusivities in undoped and acceptor or donor doped alumina are identical within a factor of about 2. Contradictory findings in the past on the impact of Mg and Ti on the oxygen diffusion can be rationalised due to published similar calculated energies for the most probable dopant incorporation reactions. Al self-diffusion is much more rapid than oxygen diffusion in undoped and Ti-doped α-alumina. In this work we show for the first time that Mg doping drastically reduces the Al diffusivity in α-alumina.
elib-URL des Eintrags: | https://elib.dlr.de/136973/ | ||||||||||||||||||||
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Dokumentart: | Zeitschriftenbeitrag | ||||||||||||||||||||
Titel: | Self-diffusion in high-purity a-Al2O3: Comparison of Ti-doped, Mg-doped and undoped single crystals | ||||||||||||||||||||
Autoren: |
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Datum: | 2 August 2020 | ||||||||||||||||||||
Erschienen in: | Journal of the European Ceramic Society | ||||||||||||||||||||
Referierte Publikation: | Ja | ||||||||||||||||||||
Open Access: | Ja | ||||||||||||||||||||
Gold Open Access: | Nein | ||||||||||||||||||||
In SCOPUS: | Ja | ||||||||||||||||||||
In ISI Web of Science: | Ja | ||||||||||||||||||||
Band: | 41 | ||||||||||||||||||||
DOI: | 10.1016/j.jeurceramsoc.2020.07.064 | ||||||||||||||||||||
Seitenbereich: | Seiten 663-668 | ||||||||||||||||||||
Verlag: | Elsevier | ||||||||||||||||||||
ISSN: | 0955-2219 | ||||||||||||||||||||
Status: | veröffentlicht | ||||||||||||||||||||
Stichwörter: | Alumina Ti-doped Mg-doped Tracer diffusion SIMS | ||||||||||||||||||||
HGF - Forschungsbereich: | Luftfahrt, Raumfahrt und Verkehr | ||||||||||||||||||||
HGF - Programm: | Raumfahrt | ||||||||||||||||||||
HGF - Programmthema: | Raumtransport | ||||||||||||||||||||
DLR - Schwerpunkt: | Raumfahrt | ||||||||||||||||||||
DLR - Forschungsgebiet: | R RP - Raumtransport | ||||||||||||||||||||
DLR - Teilgebiet (Projekt, Vorhaben): | R - Wiederverwendbare Raumfahrtsysteme (alt) | ||||||||||||||||||||
Standort: | Köln-Porz | ||||||||||||||||||||
Institute & Einrichtungen: | Institut für Werkstoff-Forschung > Mikroanalyse | ||||||||||||||||||||
Hinterlegt von: | Kelm, Dr. Klemens | ||||||||||||||||||||
Hinterlegt am: | 03 Nov 2020 10:17 | ||||||||||||||||||||
Letzte Änderung: | 01 Mär 2023 03:00 |
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