The averaged complex dielectric function of polycrystalline , , , , and was determined by spectroscopic ellipsometry covering the mid infrared to the ultraviolet spectral range. The dielectric functions and correspond to the perpendicular and parallel dielectric tensor components relative to the crystallographic -axis of these hexagonal compounds. The optical response is represented by a dispersion model with Drude–Lorentz and critical point contributions. In the low energy range the electrical resistivity is obtained from the Drude term and ranges from for to for . Furthermore, several compositional dependent interband electronic transitions can be identified. For the most important ones, shows maxima at: 0.78, 1.23, 2.04, 2.48, and 3.78 eV for ; 0.38, 1.8, 2.6, and 3.64 eV for ; 0.3, 0.92, and 2.8 eV in ; 0.45, 0.98, and 2.58 eV in ; and 0.8, 1.85, 2.25, and 3.02 eV in .
Spectroscopic ellipsometry study on the dielectric function of bulk , , , , and MAX-phases
A. Mendoza-Galván, M. Rybka, K. Järrendahl, H. Arwin, M. Magnuson, L. Hultman, M. W. Barsoum; Spectroscopic ellipsometry study on the dielectric function of bulk , , , , and MAX-phases. J. Appl. Phys. 1 January 2011; 109 (1): 013530. https://doi.org/10.1063/1.3525648
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