Pressure-induced phase transition on K2MoO4: A Raman scattering study and ab initio calculations

► We reports high pressure Raman scattering results on dipotassium molybdate. ► Our study indicates a pressure-induced first-order phase transition at around 2.16 GPa. ► DFT calculations indicate that phase transition is connected with the increase of KO6 distortion. ► Tiltings and/or rotations of the MoO4 tetrahedra are related to increased disorder.