The first-principles study on Zr3Al and Sc3Al in L1(2) structure

Abstract

The elastic, electronic, and phonon properties of the intermetallic compounds Zr3Al and Sc3Al in the L1(2) structure have been investigated in detail by employing an ab initio pseudopotential method and a linear-response technique within a generalized gradient approximation (GGA) of the density-functional theory (OFT) scheme. The calculated ground-state properties such as lattice constants and bulk modulus agree well with the previous theoretical calculations. The numerical first-principles calculations of the elastic constants have been used to calculate C-11, C-12, and C-44 for Zr3Al and Sc3Al. The electronic band structures of Zr3Al and Sc3Al show that at the Fermi level, a major part of the contribution comes from Zr 4d (Sc 3d) states. The phonon-dispersion curves and phonon total and partial density of states based on the linear-response method have been investigated for both materials. Temperature variations of specific heat capacity in the range of 0-500 K are obtained using the quasi-harmonic model. (C) 2013 Elsevier Ltd. All rights reserved.