  The high pressure behaviour of 3R-NbS2 has been investigated by
angle-dispersive X-ray powder diffraction using diamond anvil cells up to 14
GPa. The compression behaviour of the structure is highly anisotropic. The
compressibility perpendicular to the layers is 2.5 times higher than within the
layers. A fit of a 3rd-order Birch-Murnaghan equation of state gave a volume at
zero pressure V0=174(1)\AA^3 and a bulk modulus b0=57(1) GPa, with a pressure
derivative b'=8.6(5).
