Thermal stability and elastic properties of intermetallics Mg2Pb

The stability and elastic properties of Mg2Pb are investigated by the first principles method, using the method of ultrasoft pseudopotential within the generalized gradient approximation based on density functional theory. Cohesive energy and formation enthalpy show that Mg2Pb is stable. Similar result is also obtained by the energy band structure and density of states (DOS) analysis. The thermal data of Mg2Pb are calculated using Debye's quasi-harmonic approximation, such as heat capacity and Gibbs free energy. Based on the CV, we found that the Debye temperature of Mg2Pb is 247.2 K. Young's modulus and shear modulus for Mg2Pb are 68.6 and 27.9 GPa calculated from the theoretical elastic constants by Voigt–Reuss–Hill averaging scheme.