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The actinides - a beautiful ending of the Periodic Table
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics. (Condensed Matter Theory Group)
2007 (English)In: Journal of Alloys and Compounds, ISSN 0925-8388, Vol. 444, 202-206 p.Article in journal (Refereed) Published
Abstract [en]

The 5f elements, actinides, show many properties which have direct correspondence to the 4f transition metals, the lanthanides. The remarkable similarity between the solid state properties of compressed Ce and the actinide metals is pointed out in the present paper. The alpha-gamma transition in Ce is considered as a Mott transition, namely, from delocalized to localized 4f states. An analogous behavior is also found for the actinide series, where the sudden volume increase from Pu to Am can be viewed upon as a Mott transition within the 5f shell as a function of the atomic number Z. On the itinerant side of the Mott transition, the earlier actinides (Pa-Pu) show low symmetry structures at ambient conditions; while across the border, the heavier elements (Am-Cf) present the dhcp structure, an atomic arrangement typical for the trivalent lanthanide elements with localized 4f magnetic moments. The reason for an isostructural Mott transition of the f electron in Ce, as opposed to the much more complicated cases in the actinides, is identified. The strange appearance of the delta-phase (fcc) in the phase diagram of Pu is another consequence of the border line behavior of the 5f electrons. The path leading from delta-Pu to alpha-Pu is identified.

Place, publisher, year, edition, pages
2007. Vol. 444, 202-206 p.
Keyword [en]
actinides, high-pressure behaviors, electronic structure
National Category
Physical Sciences
URN: urn:nbn:se:uu:diva-151547DOI: 10.1016/j.jallcom.2006.12.111ISI: 000249996400037OAI: oai:DiVA.org:uu-151547DiVA: diva2:410359
Available from: 2011-04-13 Created: 2011-04-13 Last updated: 2012-03-18Bibliographically approved

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Johansson, Börje
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