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In this paper we report a new high-pressure rhombohedral phase of Ce2Zr2O8observed from high-pressure angle-dispersive x-ray diffraction and Ramanspectroscopy studies up to nearly 12 GPa. The ambient-pressure cubic phase ofCe2Zr2O8 transforms to a rhombohedral structure beyond 5 GPa with a feebledistortion in the lattice. Pressure evolution of unit-cell volume showed achange in compressibility above 5 GPa. The unit-cell parameters of thehigh-pressure rhombohedral phase at 12.1 GPa are ah = 14.6791(3) {\AA}, ch =17.9421(5) {\AA}, V = 3348.1(1) {\AA}3. The structure relation between theparent cubic (P2_13) and rhombohedral (P3_2) phases were obtained bygroup-subgroup relations. All the Raman modes of the cubic phase showed linearevolution with pressure with the hardest one at 197 cm-1. Some Raman modes ofthe high-pressure phase have a non-linear evolution with pressure and softeningof one low-frequency mode with pressure is found. The compressibility, equationof state, and pressure coefficients of Raman modes of Ce2Zr2O8 are alsoreported.

New high-pressure phase and equation of state of Ce2Zr2O8