日本金属学会誌

J. Japan Inst. Met. Mater, Vol. 81, No. 02 (2017),
pp. 66-70

Molecular Dynamics Study on Structural Relaxation Processes in Amorphous Germanium

Shigetaka Imabayashi 1 and Manabu Ishimaru 1

1 Department of Materials Science and Engineering, Kyushu Institute of Technology

Abstract:

Structural relaxation of amorphous germanium has been examined by molecular dynamics simulations based on the empirical Tersoff interatomic potential. Although the Tersoff potential overestimated both the melting and glass transition temperatures, it was found that this potential can reproduce the behavior of structural relaxation. The potential energy decreased with thermal annealing below the glass transition temperature, but it sometimes increased during structural relaxation. The mean square displacement of atoms also increased at the corresponding period. These changes were attributed to the cooperative atomic motion during structure relaxation. Atomic trajectories revealed that structural changes are induced by spatially- and temporally-inhomogeneous atomic motions: atomic mobile and immobile regions coexisted during structural relaxation.

[doi:10.2320/jinstmet.J2016051]


(Received 2016/09/07)

Keywords:

amorphous, germanium structural relaxation, molecular dynamics simulation, empirical interatomic potential


PDF(Free)PDF (Free)     Table of ContentsTable of Contents

Please do not copy without permission.