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Dielectric properties of Ti2AlC and Ti2AlN MAX phases: The conductivity anisotropy
Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics.ORCID iD: 0000-0002-2837-3656
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2008 (English)In: Journal of Applied Physics, ISSN 0021-8979, Vol. 104, no 2Article in journal (Refereed) Published
Abstract [en]

The optical properties of Ti2AlN and Ti2AlC were determined in the 2-80 eV energy range by electron energy loss spectroscopy and in the visible-ultraviolet range, from 1.6 to 5.5 eV, by spectroscopic ellipsometry. Both experimental techniques are angular resolved and in very good agreement over their overlapping energy range. We observe a dependence of the dielectric function as a function of the crystallographic orientation of the crystals. In particular, we notice a shift of the energy position of the plasmon absorption of Ti2AlC with respect to Ti2AlN. Moreover, a drastic change is also observed in the shape of the dielectric function as a function of the composition (or valence electron concentration). The dielectric functions are fitted to an empirical semiclassic Drude-Lorentz model to obtain physical parameters such as the relaxation times. These microscopic parameters are then used in a macroscopic model to yield the transport properties such as the static conductivity as function of the crystal orientation. Ti 2AlN is found to be a better conductor than Ti2AlC in all orientations, which is consistent with experimental measurements. A comparison of the electrical and optical properties of these two compounds is made in terms of different electronic properties and interband-intraband transitions deduced from our model. © 2008 American Institute of Physics.

Place, publisher, year, edition, pages
2008. Vol. 104, no 2
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Natural Sciences
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URN: urn:nbn:se:liu:diva-42705DOI: 10.1063/1.2960340Local ID: 68322OAI: oai:DiVA.org:liu-42705DiVA: diva2:263562
Available from: 2009-10-10 Created: 2009-10-10 Last updated: 2016-08-31

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Hultman, Lars

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