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Abstract
Recently, a series of high-purity Ti3(Al1−xSix)C2 solid solutions with new compositions (x = 0.0, 0.2, 0.4, 0.6, 0.8 and 1.0) have been reported with interesting mechanical properties. Here, we have employed density functional theory for Ti3(Al1−xSix)C2 solid solutions to calculate a wider range of physical properties including structural, electronic, mechanical, thermal and optical. With the increase of x, a decrease of cell parameters is observed. All elastic constants and moduli increase with x. The Fermi level gradually increases, moving towards and past the upper bound of the pseudogap, when the value of x goes from zero to unity, indicating that the structural stability reduces gradually when the amount of Si increases within the Ti3(Al1−xSix)C2 system. In view of Cauchy pressure, Pugh’s ratio and Poisson’s ratio all compositions of Ti3(Al1−xSix)C2 are brittle in nature. Comparatively, low Debye temperature, lattice thermal conductivity and minimum thermal conductivity of Ti3AlC2 favor it to be a thermal barrier coating material. High melting temperatures implies that the solid solutions Ti3(Al1−xSix)C2 may have potential applications in harsh environments. In the visible region (1.8–3.1 eV), the minimum reflectivity of all compositions for both polarizations is above 45%, which makes them potential coating materials for solar heating reduction.
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1 University of Rajshahi, Department of Physics, Rajshahi, Bangladesh (GRID:grid.412656.2) (ISNI:0000 0004 0451 7306)
2 Queensland University of Technology (QUT), School of Chemistry and Physics and Centre for Materials Science, Brisbane, Australia (GRID:grid.1024.7) (ISNI:0000000089150953); University of New South Wales (UNSW Sydney), School of Physics, Kensington, Sydney, Australia (GRID:grid.1005.4) (ISNI:0000 0004 4902 0432); Jashore University of Science and Technology, Department of Physics, Jashore, Bangladesh (GRID:grid.1005.4)
3 Bangladesh Army University of Science and Technology, Department of Arts and Sciences, Saidpur, Nilphamari, Bangladesh (GRID:grid.1005.4)
4 Coventry University, Faculty of Engineering, Environment and Computing, Coventry, UK (GRID:grid.8096.7) (ISNI:0000000106754565); Imperial College, Department of Materials, London, UK (GRID:grid.7445.2) (ISNI:0000 0001 2113 8111)
5 University of Rajshahi, Department of Physics, Rajshahi, Bangladesh (GRID:grid.412656.2) (ISNI:0000 0004 0451 7306); International Islamic University Chittagong, Kumira, Chittagong, Bangladesh (GRID:grid.442959.7) (ISNI:0000 0001 2300 5697)
6 Queensland University of Technology (QUT), School of Chemistry and Physics and Centre for Materials Science, Brisbane, Australia (GRID:grid.1024.7) (ISNI:0000000089150953)