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Abstract

The averaged complex dielec. function ε = (2ε.perp. + ε.dblvert.)/3 of polycryst. Ti2AlN, Ti2AlC, Nb2AlC, (Ti0.5,Nb0.5)2AlC, and Ti3GeC2 was detd. by ellipsometry covering the mid IR to the UV spectral range. The dielec. functions ε.perp. and ε.dblvert. correspond to the perpendicular and parallel dielec. tensor components relative to the crystallog. c-axis of these hexagonal compds. The optical response is represented by a dispersion model with Drude-Lorentz and crit. point contributions. In the low energy range the elec. resistivity is obtained from the Drude term and ranges from 0.48 μΩ m for Ti3GeC2 to 1.59 μΩ m for (Ti0.5,Nb0.5)2AlC. Also, several compositional dependent interband electronic transitions can be identified. For the most important ones, Im (ε) shows maxima at: 0.78, 1.23, 2.04, 2.48, and 3.78 eV for Ti2AlN; 0.38, 1.8, 2.6, and 3.64 eV for Ti2AlC; 0.3, 0.92, and 2.8 eV in Nb2AlC; 0.45, 0.98, and 2.58 eV in (Ti0.5,Nb0.5) 2AlC; and 0.8, 1.85, 2.25, and 3.02 eV in Ti3GeC2. (c) 2011 American Institute of Physics. [on SciFinder(R)]

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Mendoza-Galván, A., Rybka, M., Järrendahl, K., Arwin, H., Magnuson, M., Hultman, L., & Barsoum, M. W. (2011). Spectroscopic ellipsometry study on the dielectric function of bulk Ti2AlN, Ti2AlC, Nb2AlC, "(Ti0.5 ,Nb0.5)2AlC, and Ti3GeC2 MAX-phases. Journal of Applied Physics, 109(1). https://doi.org/10.1063/1.3525648

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