Abstract
The structural and electronic properties of ternary layered Ta 2AlC ceramics have been studied using the first-principle method based on the density-functional theory. We have obtained the equilibrium lattice parameters and the equilibrium atomic positions in the unit cell. The equilibrium lattice parameters are computed to be a= b=3.15 Å and c=13.95 Å. The internal coordinates of Ta are determined to be (1/3, 2/3, 0.092). The band structure and density of states reveal that Ta 2AlC is an electronic conductor. The charge density distribution shows that the Ta and C atoms form a strong Ta–C–Ta covalently bonded chain.
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