PHONON FREQUENCIES IN METALLIC GLASSES

The Ashcroft empty core model potential is used to derive the effectiv e interatomic potential, V-eff(r), and the pair correlation function, g(r), of metallic glasses through the pseudopotential approach. The on ly parameter r(c) (core radius) is chosen to make the calculated g(r) as close as possible with available experimental data. V-eff(r) alongw ith g(r) of the glass is used to evaluate longitudinal and transverse phonon frequencies by the use of the Takeno and Goda equations. The fo rmulation reproduces the main characteristics of the dispersion curves obtained by computer simulation techniques.