The in-situ high-pressure structures of wulfenite have been investigated by means of angular dis-persive X-ray diffraction with diamond anvil cell and synchrotron radiation.In the pressure up to 22.9 GPa, a pressure-induced scheelite-to-fergusonite transition is observed at about 10.6 GPa.The pressure dependence for the lattice parameters of wulfenite is reported, and the axial compression coefficients Ka0 =-1.36×10-3 GPa-1 and Kc0 =-2.78×10-3 GPa-1 are given.The room-temperature isothermal bulk modulus is also obtained by fitting the P-V data using the Murnaghan equation of state.
