  The high-pressure structural behavior of europium orthovanadate has been
studied using in-situ, synchrotron based, high-pressure x-ray powder
diffraction technique. Angle-dispersive x-ray diffraction measurements were
carried out at room temperature up to 34.7 GPa using a diamond-anvil cell,
extending the pressure range reported in previous experiments. We confirmed the
occurrence of zircon-scheelite phase transition at 6.8 GPa and the coexistence
of low- and high-pressure phases up to 10.1 GPa. In addition, clear evidence of
a scheelite-fregusonite transition is found at 23.4 GPa. The fergusonite
structure remains stable up to 34.7 GPa, the highest pressure reached in the
present measurements. A partial decomposition of EuVO4 was also observed from
8.1 to 12.8 GPa, however, this fact did not preclude the identification of the
different crystal structures of EuVO4. The crystal structures of the different
phases have been Rietveld refined and their equations of state (EOS) have been
determined. The results are compared with the previous experimental data and
theoretical calculations.
