TITLE

Switchable mirrors based on nickel-magnesium films

AUTHOR(S)
Richardson, T. J.; Slack, J. L.; Armitage, R. D.; Kostecki, R.; Farangis, B.; Rubin, M. D.
PUB. DATE
May 2001
SOURCE
Applied Physics Letters;5/14/2001, Vol. 78 Issue 20, p3047
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
An electrochromic mirror electrode based on reversible uptake of hydrogen in nickel magnesium alloy films is reported. Thin, magnesium-rich Ni-Mg films prepared on glass substrates by co-sputtering from Ni and Mg targets are mirror-like in appearance and have low visible transmittance. Upon exposure to hydrogen gas or on cathodic polarization in alkaline electrolyte, the films take up hydrogen and become transparent. When hydrogen is removed, the mirror properties are recovered. The transition is believed to result from reversible formation of Mg[sub 2]NiH[sub 4] and MgH[sub 2]. A thin overlayer of palladium was found to enhance the kinetics of hydrogen insertion and extraction, and to protect the metal surface against oxidation. © 2001 American Institute of Physics.
ACCESSION #
4710703

 

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