Mishra, A. K.; Murli, C.; Singhal, A.; Sharma, S. M.
ABSTRACT
The high pressure behavior of U2O(PO4)2 has been investigated with the help of Raman scattering and X-ray diffraction measurements up to
~14 and 6.5 GPa, respectively. The observed changes in the Raman spectra as well as the X-ray diffraction patterns suggest that
U2O(PO4)2 undergoes a phase transition at 6 GPa to a mixture of a disordered ambient pressure phase and a new high pressure phase. The new phase resembles the triclinic mixed-valence phase of uranium orthophosphate
(U(UO2)(PO4)2). On release of pressure the initial phase is not retrieved.