Dislocation Model of Amorphous Germanium

Abstract

From a point of view that a crystal containing many dislocations can be a model of an amorphous solid, the structure of amorphous Ge has been generated on a computer by introducing many screw dislocations regularly into a diamond lattice. It is expected that the radial distribution function for the distance smaller than the period of the dislocation array is little influenced by the regularity and is mainly determined by the core structure of dislocations. In relaxing the atom positions to minimize the total energy, the Keating potential was used for the interatomic interactions. It is found that the radial distribution function for the dislocation density of 0.25 b per atomic volume or 4.4×10 14 cm -2 agrees well with experiments. The reduced intensity function was also calculated. Agreement with experiments is good, except that it shows the higher first peak than experiments.