TY - JOUR T1 - Effect of Hydrogen Insertion on the Optical Properties of PD-Coated Magnesium Lanthanides JF - Electrochimica Acta Y1 - 1998/ A1 - Klaus von Rottkay A1 - Michael D. Rubin A1 - Franck Michalak A1 - Robert D. Armitage A1 - Thomas J. Richardson A1 - Jonathan L. Slack A1 - Peter A. Duine AB - 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 caplayer to Pd-H was determined. It is shown that the pd layer limits the visible transmittance of the hyrdrided 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. CY - London, U.K. U1 -

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U2 - LBNL-42277 ER -