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Effect of hydrogen insertion on the optical properties of Pd-coated magnesium lanthanides

Authors
Journal
Electrochimica Acta
0013-4686
Publisher
Elsevier
Publication Date
Volume
44
Issue
18
Identifiers
DOI: 10.1016/s0013-4686(99)00025-0
Keywords
  • Gadolinium Magnesium
  • Samarium Magnesium
  • Electrochromic Hydride
  • Switchable Mirror
  • Optical Constants
Disciplines
  • Chemistry

Abstract

Abstract Metallic magnesium lanthanide thin films upon insertion of hydrogen transform to a highly transparent hydride phase. With a Pd overlayer, the transformation can be produced either by electrochemical insertion of hydrogen or by exposing the film to hydrogen gas. Unlike amorphous oxide electrochromics, the transformation is accompanied by a large change in visible reflectance (about 50%). The optical switching effect in these materials is investigated in terms of changes in the complex refractive index as determined by variable-angle spectroscopic ellipsometric and normal-incidence radiometric measurements over the solar spectrum. Furthermore the optical effect of converting the Pd cap-layer to Pd–H was determined. It is shown that the Pd layer limits the visible transmittance of the hydrided stack to about 35–40%. Whereas the extinction coefficient of the dehydrided LnMg-layers at 550 nm is between 2.2 and 3.1, it is as low as 10 −4 in the transparent state.

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