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Issue 9, 2001
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Electronic and structural properties of the layered ternary carbide Ti3AlC2

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Abstract

The electronic and structural properties of the layered ternary compound Ti3AlC2 have been determined using the ab initio pseudopotential method based on density functional theory. We have obtained the equilibrium lattice parameters, the equilibrium atomic positions in the unit cell, and interatomic distances. The calculated bulk modulus is 190 GPa and is comparable to that of TiC. The band structure, density of states (DOS) and effective charges are presented and compared with those of TiC. The band structure indicates that Ti3AlC2 is an electronic conductor. The electronic structure discloses that the bonding in Ti3AlC2 is anisotropic and metallic–covalent–ionic in nature. Compare to the structure of TiC, the presence of Al changes the Ti–C–Ti–C covalent bond chain into a Ti–C–Ti–C–Ti–Al bond chain through its reaction with Ti, forming the layered structure. Effective charge calculations suggest the ionic formula of Ti3AlC2 to be (Ti1.18+)(Ti0.59+)2(Al0.52−)(C0.92−)2.

Graphical abstract: Electronic and structural properties of the layered ternary carbide Ti3AlC2

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Publication details

The article was received on 16 Feb 2001, accepted on 23 May 2001 and first published on 30 Jul 2001


Article type: Paper
DOI: 10.1039/B101520F
Citation: J. Mater. Chem., 2001,11, 2335-2339
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    Electronic and structural properties of the layered ternary carbide Ti3AlC2

    Y. C. Zhou, X. H. Wang, Z. M. Sun and S. Q. Chen, J. Mater. Chem., 2001, 11, 2335
    DOI: 10.1039/B101520F

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