  Two-dimensional materials have proven to be a prolific breeding ground of new
and unstudied forms of magnetism and unusual metallic states, particularly when
tuned between their insulating and metallic phases. In this paper we present
work on a new metal to insulator transition system FePS$_3$ . This compound is
a two-dimensional van-der-Waals antiferromagnetic Mott insulator. Here we
report the discovery of an insulator-metal transition in FePS$_3$, as evidenced
by x-ray diffraction and electrical transport measurements, using high pressure
as a tuning parameter. Two structural phase transitions are observed in the
x-ray diffraction data as a function of pressure and resistivity measurements
show evidence of onset of a metallic state at high pressures. We propose models
for the two new structures that can successfully explain the x-ray diffraction
patterns.
