Structural and Electronic Properties of Magnesium-3D Transition Metal Switchable Mirrors

TitleStructural and Electronic Properties of Magnesium-3D Transition Metal Switchable Mirrors
Publication TypeConference Paper
Year of Publication2002
AuthorsBaker Farangis, Ponnusamy Nachimuthu, Thomas J Richardson, Jonathan L Slack, Bruno K Meyer, Rupert CC Perera, Michael D Rubin
Conference NameFifth International Meeting on Electrochromism
Date Published12/2002
Conference LocationGolden, CO
KeywordsEXAFS, Hydrogen storage materials, NEXAFS, thin films, x-ray diffraction
Abstract

We have observed reversible mirror-to-transparent state switching in a variety of mixed metal thin films containing magnesium and first-row transition elements including Ni, Fe, Co, Mn, and Ti. The very large changes in both reflectance and transmittance on loading these films with hydrogen are accompanied by significant structural and electronic transformations. The valence states and coordination of metal atoms during hydrogen loading were followed using dynamic in situ transmissionmode X-ray absorption spectroscopy. Time-resolved Mg K-edge and Ni, Co, Mn, and Ti L-edge spectra reflect both reversible and irreversible changes in the metal environments. These spectra are compared to those of reference materials and to predictions from calculations.

DOI10.1016/j.ssi.2003.08.041
LBNL Report Number

LBNL-51415