Vibrational and Elastic Properties of Bulk Metallic Glass: Application to Pd64Fe16P20

Payal N. Chauhan; Chaudhari Prakruti; R.H. Joshi; Nisarg K. Bhatt; Brijmohan Y. Thakore

doi:10.4028/www.scientific.net/AMR.1141.91

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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 1141Vibrational and Elastic Properties of Bulk...

Vibrational and Elastic Properties of Bulk Metallic Glass: Application to Pd₆₄Fe₁₆P₂₀

Abstract:

Different elastic properties of Pd-based Pd₆₄Fe₁₆P₂₀ have been computed using two different forms of pseudopotential. Both the forms differ within the core region suggesting different degrees of orthogonalization and its r-dependence, while outside the core both preserves the Columbic nature. The only parameter, the core radius, separates these regions, and it is calculated using the realistic assumption based on the nearest neighbor distance. Further, five different forms of the local field correlated functions, namely, Hartree (H), Taylor (T), Ichimaru and Utsumi (IU), Farid et al. (F) and Sarkar et al. (S) are examined for better understanding regarding the screening effect on different elastic constants for Pd₆₄Fe₁₆P₂₀ bulk metallic glass. The calculated results for the various elastic moduli, Poisson's ratio, sound velocity and phonon dispersion curve are all found to be in general agreement with the available experimental data. This confirms the applicability of the model pseudopotential to bulk metallic systems.