  High pressure behaviour of liquid GeO2 is investigated by means of molecular
dynamics simulations in the pressure range 0-20 GPa and at various
temperatures. In agreement with the recent experiments (PRL, 92, 155506, 2004),
Ge-O coordination increases under compression. For 1650 K, at ~11.5 GPa the
structure becomes 6 coordinated with a discontinuous change in the density. The
transition from the low density liquid (LDL) to high density liquid (HDL) is
found to be reversible and the transition pressure increases with the
temperature. At lower temperatures, the low density to high density transition
is found to be continuous, but with the coexistence of two structures.
