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Complex Structures of Cerium

The phases of cerium above 5GPa have been studied using angle-dispersive powder diffraction techniques. With filings of Ce, a C-face-centred monoclinic structure with four atoms per unit cell is obtained between 5 and 12GPa. Heating to 373K for many hours yields the known α-U phase. With a single cut piece as a sample, the α-U phase is obtained at RT.