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Journal article
Spectroscopic ellipsometry study on the dielectric function of bulk Ti2AlN, Ti2AlC, Nb2AlC, (Ti-0.5, Nb-0.5)(2)AlC, and Ti3GeC2 MAX-phases
Journal of applied physics, v 109(1)
01 Jan 2011
Abstract
The averaged complex dielectric function epsilon = (2 epsilon(perpendicular to) + epsilon(parallel to))/3 of polycrystalline Ti2AlN, Ti2AlC, Nb2AlC, (Ti-0.5, Nb-0.5)(2)AlC, and Ti3GeC2 was determined by spectroscopic ellipsometry covering the mid infrared to the ultraviolet spectral range. The dielectric functions epsilon(perpendicular to) and epsilon(parallel to) correspond to the perpendicular and parallel dielectric tensor components relative to the crystallographic c-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 0.48 mu Omega m for Ti3GeC2 to 1.59 mu Omega m for (Ti-0.5, Nb-0.5)(2)AlC. Furthermore, several compositional dependent interband electronic transitions can be identified. For the most important ones, Im(epsilon) 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 (Ti-0.5, Nb-0.5)(2)AlC; and 0.8, 1.85, 2.25, and 3.02 eV in Ti3GeC2. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3525648]
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Details
- Title
- Spectroscopic ellipsometry study on the dielectric function of bulk Ti2AlN, Ti2AlC, Nb2AlC, (Ti-0.5, Nb-0.5)(2)AlC, and Ti3GeC2 MAX-phases
- Creators
- A. Mendoza-Galvan - Cinvestav Queretaro, Queretaro 76230, MexicoM. Rybka - Linkoping Univ, Dept Phys Chem & Biol, SE-58183 Linkoping, SwedenK. Jarrendahl - Linkoping Univ, Dept Phys Chem & Biol, SE-58183 Linkoping, SwedenH. Arwin - Linkoping Univ, Dept Phys Chem & Biol, SE-58183 Linkoping, SwedenM. Magnuson - Linkoping Univ, Dept Phys Chem & Biol, SE-58183 Linkoping, SwedenL. Hultman - Linkoping Univ, Dept Phys Chem & Biol, SE-58183 Linkoping, SwedenM. W. Barsoum - Drexel University
- Publication Details
- Journal of applied physics, v 109(1)
- Publisher
- American Institute of Physics
- Number of pages
- 8
- Grant note
- 80814 / Conacyt-Mexico; Consejo Nacional de Ciencia y Tecnologia (CONACyT) Knut and Alice Wallenberg Foundation; Knut & Alice Wallenberg Foundation DMR 0503711 / Ceramics Division of the National Science Foundation
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering
- Web of Science ID
- WOS:000286219300055
- Scopus ID
- 2-s2.0-78751550258
- Other Identifier
- 991019167770704721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Physics, Applied