CeO 2 transforms to an orthorhombic PbCl 2 -type structure at a pressure of about 31 GPa. The phase transition is accompanied by a 9.8% volume contraction. The bulk modulus of the low-pressure fluorite-type structure is 236(4) GPa. Comparisons are made with the high-pressure behaviour of UO 2 and ThO 2 .
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Gerward et al. (1993) studied this question.
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