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Title
Anodic oxide formation on aluminium-terbium alloys
AuthorMardare, Andrei Ionut ; Grill, Craina Daniela ; Pötzelberger, Isabella ; Etzelstorfer, Tanja ; Stangl, Julian ; Hassel, Achim Walter
Published in
Journal of Solid State Electrochemistry, 2016, Vol. 20, Issue 6, page 1673-1681
PublishedSpringer, 2016
LanguageEnglish
Document typeJournal Article
Keywords (EN)Combinatorial libraries / High-throughput experimentation / Scanning droplet cell / Anodic oxide film / Terbium
ISSN1433-0768
URNurn:nbn:at:at-ubl:3-1289 Persistent Identifier (URN)
DOI10.1007/s10008-016-3139-1 
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 The work is publicly available
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Anodic oxide formation on aluminium-terbium alloys [4.19 mb]
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Abstract (English)

Aluminium terbium alloys were prepared by simultaneous thermal evaporation resulting in a thin film library covering a 5 to 25 at.% Tb compositional spread. Synchrotron x-ray diffraction (XRD) proves all of the alloys to be amorphous. Scanning electron microscopy (SEM) measurements reveal the structural changes upon increase in Tb content with the formation of small, Tb-rich segregations right before a drastic change in morphology around 25 at.% Tb. Anodic oxides were formed systematically in cyclic voltammograms using scanning droplet cell microscopy. Coulometric analysis revealed a linear thickness over formation potential behaviour with film formation factors ranging from 1.2 nm V1 (5 at.% Tb) to 1.6 nm V1 (25 % Tb). Electrochemical impedance spectroscopy was performed for each incremental oxidation step resulting in a linear relation between inverse capacity and formation potential with dielectric constants ranging from 8 (5 at.% Tb) to 16 (25 at.% Tb).

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CC-BY-License (4.0)Creative Commons Attribution 4.0 International License