Theoretical study of dynamical properties of binary metallic glasses in the harmonic approximation

A theory is developed to calculate the vibrational frequency spectrum of binary amorphous solids in the harmonic approximation. It is shown that the spectrum of isotropically disordered material can be separated into longitudinal acoustic (LA), transverse acoustic (TA), longitudinal optical (LO) and...

Full description

Saved in:
Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 1994-05, Vol.181-182 (1-2), p.1043-1046
Main Authors: Sato, H., Tanimori, S., Ishida, A., Itoh, M.
Format: Article
Language:English
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A theory is developed to calculate the vibrational frequency spectrum of binary amorphous solids in the harmonic approximation. It is shown that the spectrum of isotropically disordered material can be separated into longitudinal acoustic (LA), transverse acoustic (TA), longitudinal optical (LO) and transverse optical (TO) phonons in a strict sense. Calculations are performed both analytically and numerically for each mode of Mg sub 70 Zn sub 30 metallic glass. It is clarified that the roton-like dispersion curve of the longitudinal vibrations, determined by an inelastic neutron-scattering experiment, is well described as consisting of LA and LO phonons.
ISSN:0921-5093
DOI:10.1016/0921-5093(94)90797-8