  A nanometric Sb2Te3 rhombohedral phase was produced from Sb and Te by
mechanical alloying for 3 hours and its structural stability was studied by
synchrotron X-ray diffraction (XRD) and Raman spectroscopy (RS) measurements as
a function of pressure. A phase transformation from the ambient pressure
rhombohedral phase into a {\beta}-Sb2Te3 monoclinic structure between 9.8 and
13.2 GPa is observed by XRD. This phase transformation is confirmed by the
Raman spectroscopy measurements. The pressure dependence of the volume fited to
a Birch-Murnaghan equation of state gives a bulk modulus B0 = 40.6 +- 1.5 GPa
and B'0 = 5.1 +- 0.6. The bulk modulus of the nano-Sb2Te3 seems to be slightly
smaller than that for its bulk counterpart (44.8 GPa).
