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Spectroscopic ellipsometry study on the dielectric function of bulk Ti2AlN,Ti2AlC, Nb2AlC, (Ti0.5,Nb0.5)2AlC, and Ti3GeC2 MAX-phases
Cinvestav-Querétaro, Libramiento Norponiente.
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, The Institute of Technology.
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, The Institute of Technology.ORCID iD: 0000-0003-2749-8008
Linköping University, Department of Physics, Chemistry and Biology, Applied Optics . Linköping University, The Institute of Technology.ORCID iD: 0000-0001-9229-2028
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2011 (English)In: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, Vol. 109, 013530- p.Article in journal (Refereed) Published
Abstract [en]

The averaged complex dielectric function =2+ /3 of polycrystalline Ti2AlN, Ti2AlC,Nb2AlC, Ti0.5,Nb0.52AlC, and Ti3GeC2 was determined by spectroscopic ellipsometry coveringthe mid infrared to the ultraviolet spectral range. The dielectric functions and correspond tothe perpendicular and parallel dielectric tensor components relative to the crystallographic c-axis ofthese 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 obtainedfrom the Drude term and ranges from 0.48 m for Ti3GeC2 to 1.59 m for Ti0.5,Nb0.52AlC.Furthermore, several compositional dependent interband electronic transitions can be identified. Forthe most important ones, Im 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 inTi0.5,Nb0.52AlC; and 0.8, 1.85, 2.25, and 3.02 eV in Ti3GeC2.

Place, publisher, year, edition, pages
USA: American Institute of Physics , 2011. Vol. 109, 013530- p.
Keyword [en]
MAX-phases, ellipsometry
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:liu:diva-65629DOI: 10.1063/1.3525648ISI: 000286219300055OAI: oai:DiVA.org:liu-65629DiVA: diva2:397396
Note
Original Publication: Arturo Mendoza-Galvan, M Rybka, Kenneth Järrendahl, Hans Arwin, Martin Magnuson, Lars Hultman and Michel Barsoum, Spectroscopic ellipsometry study on the dielectric function of bulk Ti2AlN,Ti2AlC, Nb2AlC, (Ti0.5,Nb0.5)2AlC, and Ti3GeC2 MAX-phases, 2011, Journal of Applied Physics, (109), 013530. http://dx.doi.org/10.1063/1.3525648 Copyright: American Institute of Physics http://www.aip.org/Available from: 2011-02-16 Created: 2011-02-14 Last updated: 2017-12-11Bibliographically approved

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Järrendahl, KennethArwin, HansMagnuson, MartinHultman, Lars

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