Tunable reflectance Mg-Ni-H films

Abstract

Mg2NiHx switchable mirrors, which switch from shiny metallic Mg2Ni to transparent Mg2NiH4, are shown to exhibit also dramatic reversible changes in reflectance at remarkably low hydrogen concentrations. Already for x≅0.3a232nm thick Mg 2NiHx film has an absorptance of ∼90% over the whole visible optical spectrum. The transition from highly reflective to black occurs in the concentration interval 0.1