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- W2042076407 abstract "The present work demonstrates the formation of porous niobium films with separated columnar structures by oblique angle magnetron sputtering for capacitor application. The niobium films deposited on textured aluminium substrates, which had concave cell structures with the cell sizes ranging from 125 nm to 550 nm, consist of isolated columns of niobium with wider gaps between columns developing on the substrates with larger cell sizes. The surface areas of the deposited films, evaluated by the capacitance of the anodic films formed at several voltages, increased with an increase in the cell size of substrate. The surface area decreases with an increase in the formation potential of anodic films from 2 V to 10 V vs Ag/AgCl, because the gaps are filled with anodic oxide as a consequence of the large Pilling–Bedworth ratio of 2.6 for the Nb/Nb 2 O 5 system. The reduction of the surface area is suppressed when the substrate with larger cell size is used, due to the formation of niobium columns with wider gaps, which are not filled with anodic oxide. The high surface area even at higher formation voltages of the anodic films is a requisite for capacitor application." @default.
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- W2042076407 date "2009-10-01" @default.
- W2042076407 modified "2023-09-26" @default.
- W2042076407 title "Formation of porous niobium films by oblique angle deposition: Influence of substrate morphology" @default.
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- W2042076407 doi "https://doi.org/10.1016/j.tsf.2009.05.020" @default.
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