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Lattice Dynamics of Noble Metals on Effective Three-Body Interaction

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Coelho A., Shukla M.

Acta Physica Polonica A

1996

vol. 89

issue 5-6

615-623

Quite recently we modified the original model of Sarkar et al. for cubic metals in extending the ion-ion interaction, ion-electron interaction and the introduction of crystal equilibrium condition. We applied our scheme to alkali metals. We studied here the lattice dynamics of noble metals on our approach by calculating phonon dispersion relations along the three principal symmetry directions, [ξ00], [ξξ0] and [ξξξ] and the (θ-T) curves of three noble metals: copper, silver and gold. We obtained reasonable agreement with the experimental findings.

Lattice Dynamics of Metallic Glass Ca_{70}Mg_{30} on the Model of Bhatia and Singh

100%

Shukla M., Campanha J.

Acta Physica Polonica A

1998

vol. 94

issue 4

655-660

The lattice dynamical studies of the metallic glass Ca_{70}Mg_{30} by Bhatia and Singh on their model contained two shortcomings, firstly the electron-ion interaction matrix was wrong and secondly, the numerical value of the bulk modulus of the electron gas was accepted arbitrarily. By modifying the electron-ion dynamical matrix and determining all the model parameters from the experimental data, we made a fresh study of the lattice dynamics of Ca_{70}Mg_{30} and compared it to the earlier studies of Bhatia and Singh and also with experimental phonons.

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2 Acta Physica Polonica A

1 1998

1 1996

2 Shukla M.

1 Campanha J.

1 Coelho A.

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Lattice Dynamics of Noble Metals on Effective Three-Body Interaction

Lattice Dynamics of Metallic Glass Ca_{70}Mg_{30} on the Model of Bhatia and Singh