DELOCALIZATION OF 5F ELECTRONS IN CURIUM METAL UNDER HIGH PRESSURE
Curium metal was studied by x-ray diffraction up to 52 GPa. Starting with the double hexagonal close packed structure (Cm I), a cubic close packed structure (Cm II) was formed at 23 GPa and another high pressure phase (Cm III) at 43 GPa. The latter phase can be indexed as an orthorhombic cell of the alpha-uranium-type structure. The volume difference between the cell of Cm III and that of Cm II, together with the formation of a low symmetry (orthorhombic) crystal structure, suggests that itinerancy of the 5f electrons in curium metal starts at 43 GPa. The fact that the delocalization pressure is higher in curium than in the neighbouring americium, berkelium and californium metals is explained qualitatively on the basis of a comparison of localisation energies.
Bibliographic Reference: JOURNAL OF PHYSICS F: METAL PHYSICS VOL. 15 (1985), PP. L29-L35
Record Number: 1989123065700 / Last updated on: 1987-01-01
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