An extension to the bond rearrangement method introduced by Wooten, Wi
ner and Weaire (the www algorithm), which uses a simple algorithm to c
reate structural models of tetrahedrally bonded amorphous materials su
ch as amorphous silicon or germanium, has been developed using a paral
lel architecture. A continuous random network (CRN) model is produced
by first introducing randomized arrangements in a systematic way in a
crystal lattice, restricting the creation of ring structures within th
e lattice to five-, six- and seven-membered rings. A systematic, optim
um simulated annealing process is then applied to relax the structure
to a low energy. A model created using the process is compared with ex
periment, and with a model created using the original algorithm. The i
mprovements allow the WWW algorithm to be run on more modest computer
technology. The system has been implemented in FORTRAN, on a MEIKO com
puting surface multi-transputer system using CSTools for the extension
to a parallel architecture.