Abstract
Scandium thick-films have been deposited on molybdenum substrates by electron-beam evaporation and then transferred to deuteride. Here, we study the effects of substrate temperature (≈473 or 923K) upon the initial Sc microstructure and subsequent capacity of deuterium absorption. We find that low temperature leads to a porous fibrous structure with a narrow width, and high temperature results in a compact columnar structure with larger grain sizes. Through degassing and deuterium loading processes, both the atomic ratios Δ(D/Sc) are less than the stoichiometric ratio. It is smaller for the film deposited at 473K (~0.98) than that at 923K (~1.32). We hypothesize that this may arise from the more oxidation in the porous film than that in the compact one.
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