Elastic properties and electronic structures of typical Al-Ce structures from first-principles calculations

摘要

The elastic property and electronic structure of three typical Al-Ce structures have been studied by means of first-principles calculations within GGA approximation. The optimized structural parameters for these precipitates agree very well with experimental data. The obtained negative cohesive energy and formation enthalpy show that all of these precipitates have strong structural stability. Elastic constants as well as other mechanical parameters such as bulk modulus B, shear modulus G, Young's modulus ? and Poisson's ratio v for these phases are computed and discussed. The calculated electronic densities of state and charge distribution show the covalent features of Ce-Ce and Al-Ce bonding in three phases, which reveals the underlying mechanism for the elastic properties of these Al-Ce structures.