Ellipsometric study of the influence of the order–disorder phase transition on the optical properties and electronic structures of FeAl alloy films

Abstract The optical properties of ordered and disordered FeAl alloy films as well as those of a bulk equiatomic FeAl alloy have been measured in the photon energy range of 0.5–5.0 eV. The influence of the order-disorder structural transition on the optical properties of FeAl compounds has been studied. Experimental results for ordered FeAl are compared with the results of ab initio semi-relativistic extended linear augmented plane-wave calculations, and explained in terms of the electronic energy band structures.