Journal
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
Volume 20, Issue 6, Pages 1673-1681Publisher
SPRINGER
DOI: 10.1007/s10008-016-3139-1
Keywords
Combinatorial libraries; High-throughput experimentation; Scanning droplet cell; Anodic oxide film; Terbium
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Funding
- Johannes Kepler University Linz
- Austrian Federal Ministry of Science, Research and Economy
- National Foundation for Research, Technology and Development through Christian Doppler Laboratory for Combinatorial Oxide Chemistry (COMBOX)
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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 V-1 (5 at.% Tb) to 1.6 nm V-1 (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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