  We report detailed and extensive first-principles molecular-dynamics (MD)
simulations of the structure and electronic properties of amorphous InP
produced by rapid quenching from the liquid. The structure of the material is
found to be strongly ordered chemically, even though there is a significant
number of coordination defects and despite the presence of odd-membered rings.
We find, as a consequence, that there exists ``wrong bonds'' in the system, in
an amount of about 8%; these result from the presence of coordination defects,
not of local composition fluctuations, as has been conjectured. The system, in
fact, is found to be over-coordinated, which might be the reason for the
observed higher density of a-InP compared to c-InP. We have also investigated
the possibility of pressure-amorphizing InP. Our calculations indicate that the
cost of a transformation of the compressed zinc-blende crystal into an
amorphous phase is so large that it is very unlikely that it would take place.
