The high-pressure form of cerium metal stable above 56 kbar is found to be orthorhombic with the α-uranium type of structure. The effective metallic radius and the observed compressibility correspond to full tetravalency for cerium. A second, metastable form of cerium metal with a monoclinic structure has also been observed above 60 kbar.
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Ellinger et al. (1974) studied this question.
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