Zircon-type NdVOand scheelite-type PrVOhave been studied by means of Raman spectroscopy up to approximately 20 GPa. In the first compound, zircon-scheelite and scheelite-fergusonite phase transitions are reported at 6.4(3) and 19.6(4) GPa, respectively. In the case of scheelite-type PrVO, a reversible phase transition to a PbWO-III structure is observed at 16.8(5) GPa. In both cases, a scheelite-type structure is recovered in a metastable state at low pressures. The pressure evolution of the Raman modes is also reported. Our experimental findings are supported bycalculations, which allowed us to discuss the role of mechanic and dynamical instabilities in the phase transition mechanisms.
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