Mg–Ni–H films as selective coatings: Tunable reflectance by layered hydrogenation

van Mechelen, J.L.M.; Noheda, B.; Lohstroh, W.; Westerwaal, R.J.; Rector, J.H.; Darn, B.; Griessen, R.
May 2004
Applied Physics Letters;5/3/2004, Vol. 84 Issue 18, p3651
Academic Journal
Unlike other switchable mirrors, Mg2NiHx films show large changes in reflection that yield very low reflectance (high absorptance) at different hydrogen contents, far before reaching the semiconducting state. The resulting reflectance patterns are of interference origin, due to a self-organized layered hydrogenation mechanism that starts at the substrate interface, and can therefore be tuned by varying the film thickness. This tunability, together with the high absorptance contrast observed between the solar and the thermal energies, strongly suggests the use of these films in smart coatings for solar applications. © 2004 American Institute of Physics.


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