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Angle dispersive x-ray diffraction measurements on thorium-praseodymium mixed oxides, (Th1-yPry)O2-x [y = 0, 0.15, 0.4 and 1], have been carried out up to a pressure of around 36 GPa at ambient temperature. A structural transformation from cubic fluorite type to an orthorhombic α-PbCl2 type structure has been observed for y = 0, 0.4 and 1, at a pressure of Pt = 28.8 GPa, 28.8 GPa and 30.1 GPa respectively...
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