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General trends in the structural, electronic and elastic properties of the M3AlC2 phases (M = transition metal): A first-principle study
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General trends in the structural, electronic and elastic properties of the M3AlC2 phases (M = transition metal): A first-principle study

Xiaodong He, Yuelei Bai, Chuncheng Zhu, Yue Sun, Mingwei Li and M. W. Barsoum
Computational materials science, v 49(3), pp 691-698
01 Sep 2010
DOI: https://doi.org/10.1016/j.commatsci.2010.06.012

Abstract

Materials Science Materials Science, Multidisciplinary Science & Technology Technology
In this paper, the first-principles pseudopotential total energy method is used to predict the structural, electronic and elastic properties of the M3AlC2 (MAX) phases, where M = 3d, 4d, and 5d early transition metals. Specifically, the effects of the valence electron concentrations (VEC) of Ti, V, Cr, Zr, Nb, Mo, Hf, Ta and W were examined. The lattice constants are a linear function of the atomic diameter of the M element. In general, M d-Al p hybridizations locate just below the Fermi level and are weaker than the M d-C p bonds, which are deeper in energy. The bulk moduli of the ternary carbides are found to be proportional to the bulk moduli of the corresponding binary carbides. Because the M-Al bonds are less stiff than the M-C bonds, the latter are mainly responsible for the high bulk moduli of the M3AlC2 phases. The M-Al bonds, on the other hand, play a critical role in decreasing the bulk moduli compared to the binary carbides. (C) 2010 Elsevier B.V. All rights reserved.

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