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The reflectivities of TiN, ZrN and HfN have been measured in the spectral energy range 0.1-6.2 eV. The optical constants have been determined by means of a Kramers-Kronig analysis. A separation into interband transitions and free electron behaviour was carried out. The extended free electron region is explained and the interband transitions are compared with allowed transitions in the density of states distribution. The possibility of improving the optical selectivity by shifting EF is discussed.
Karlsson et al. (Tue,) studied this question.
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