Abstract
An LaMg 2 Ni alloy film was prepared by electron beam evaporation plus annealing. Upon hydrogen loading/unloading, the film shows the reversible conversion from a metallic, reflecting state to a semiconducting, color-neutral transparent one. The contrast ratio of the resistivity between two states is over four orders of magnitude. The lower reflection in the dehydrogenated film is attributed to the rough surface originated from the previous hydrogenation.
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