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We found that palladium-capped magnesium–niobium alloy thin films show a good optical switching property when they are exposed to a hydrogen-containing atmosphere. A switchable mirror based on a magnesium–niobium thin film was prepared on a glass substrate by cosputtering of Mg and Nb targets. Mg 1- x Nb x thin films with a 4 nm Pd overlayer can be switched reversibly between shiny mirror and transparent states with the reversible uptake of 4% hydrogen gas at room temperature. In the hydride (transparent) state, they are almost color neutral.
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Bao et al. (2006) studied this question.
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