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By Manes L. Actinides

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Complete localization: 5 f are atomic; the unsaturated shell fills according to Hund's rule, and displays a net magnetic moment. 5 f do not participate to metallic electrical conduction. Van Vleck or Curie-Weiss magnetism (see Chap. D) is expected and also ferromagnetic or anti-ferromagnetic phenomena, explained in the frame of Heisenberg like theories. ii. complete itineracy: 5 f are Bloch states in a broad band, retaining very little of their atomic character. Pauli paramagnetism is expected and metallic conduction.

5 f do not participate to metallic electrical conduction. Van Vleck or Curie-Weiss magnetism (see Chap. D) is expected and also ferromagnetic or anti-ferromagnetic phenomena, explained in the frame of Heisenberg like theories. ii. complete itineracy: 5 f are Bloch states in a broad band, retaining very little of their atomic character. Pauli paramagnetism is expected and metallic conduction. Difficulties arise when the d- and f-electrons are in an intermediate state between i. and ii. This is the case for narrow bands (Fig.

15. Experimental and calculated bulk moduli of the actinides42), compared with those of lanthanides and of transition metals. The calculated values for actinides (0, 0) peak for uranium, whereas the experimental bulk-moduli (x, R, +, A) peak for protactinium (original references to be found in42)) 2. The Mott-Like Transition Between Plutonium and Americium Whereas there are experimental evidences for the band behaviour of 5 f electrons up to plutonium (Z = 94) (see Table 3), the same criteria show that suddenly americium (Z = 95) behaves like a normal lanthanide having well localized 5 f electrons (4) and Chap.

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