Optical properties of Ti3SiC2 and Ti4AlN3
S. LiUppsala University 3 Condensed Matter Theory Group, Department of Physics, , Box 530, S-751 21 Uppsala, SwedenRajeev AhujaUppsala University 3 Condensed Matter Theory Group, Department of Physics, , Box 530, S-751 21 Uppsala, SwedenMichel W. BarsoumDrexel University 4 Department of Materials Science and Engineering, , Philadelphia, Pennsylvania 19104, USAPuru JenaVirginia Commonwealth University 1 Department of Physics, , Richmond, Virginia 23284, USAB. JohanssonRoyal Institute of Technology 2 Department of Materials Science and Engineering, , Brinellvägen 23, SE-100 44 Stockholm, Sweden
2008en
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The dielectric functions of the MAX phases, Ti3SiC2 and Ti4AlN3, have been determined from first principles calculations. We compared the dielectric functions and the reflectivity spectra of Ti3SiC2 and Ti4AlN3 with those of TiC and TiN. The optical spectra were analyzed by means of the electronic structure, which provides theoretical understanding of the conduction mechanism of these two phases. We found that Ti4AlN3 can be used to avoid solar heating and also increase the radiative cooling due to the increased thermal emittance as compared to TiN. Ti4AlN3 can therefore be a candidate coating material for temperature control of space vehicles.
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