Abstract
Using first-principles total energy calculations within the local density approximation (LDA) and the generalized gradient approximation (GGA), we have investigated the structural and elastic properties of MAlSi (M=Ca,Sr, and Ba) crystallized in hexagonal C32 structure. The lattice parameters and independent elastic constants of MAlSi have been obtained from LDA and GGA calculations. The bulk modulus along crystallographic axes of single crystal, shear modulus, Young’s modulus, and Poisson’s radio of MAlSi are also estimated. The calculated elastic moduli of MAlSi compare well with available experimental values. In addition, the mechanical anisotropy of MAlSi is also discussed.
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