Americium and Curium Chemistry and Technology: Papers from a by Dr. Glenn T. Seaborg (auth.), Norman M. Edelstein, James D.

By Dr. Glenn T. Seaborg (auth.), Norman M. Edelstein, James D. Navratil, Wallace W. Schulz (eds.)

The papers incorporated during this quantity have been offered on the symposium on "Americium and Curium Chemistry and know-how" on the foreign Chemical Congress of Pacific Basin Societies in Honolulu, Hawaii, December 16-21, 1984. This symposium venerated 40 years of analysis on americium and curium. for that reason, the papers incorporated during this quantity commence with old views at the discovery of americium and curium and the early characterization in their chemical homes, after which conceal quite a lot of matters, similar to thermodynamic homes, digital constitution, nuclear reactions, analytic chemistry, excessive strain part transitions, and technological points. therefore, this quantity is a evaluation of the chemistry of americium and curium, and gives a point of view at the present examine on those parts 40 years after their discovery. The editors want to thank the members during this symposium for his or her contributions. it's a excitement to recognize the help of Ms. Barbara Moriguchi in dealing with the executive facets of the symposium and of the construction of this quantity. April 2, 1985 Norman M. Edelstein fabrics and Molecular examine department Lawrence Berkeley Laboratory college of California Berkeley, California 94720, U.S.A. James D. Navratil Rockwell overseas Rocky residences Plant P.O. field 464 Golden, Colorado 80402-0464, U.S.A. Wallace W. Schulz Rockwell Hanford P.O. field 800 Richland, Washington 99352, U.S.A.

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160 Tu 140 a-Pu 120 Np c: 100 6 >- I- > l- (/) (/) 80 Am 60 UJ a:: Figure 3. Electrical resistivity of actinide metals. 12) 40 u 20 Po Th 100 200 300 TEMPERATURE [KJ The standard free energy of chloride formation was determined by potential measurements in molten salts 14, IS. The enthalpies of formation of Am3+ and of Cm3+ ions were determined by measuring the enthalpy of dissolution of the metals in diluted hydrochloric acid 16,17. 5 kJ/mol for curium, respectively. 2 kJ/mol (Am) and -615 ± 5 kJ/mol (Cm).

1955, ~y, 381. 14. , Report AECD-3637, Los Alamos Scientific Laboratory, July 1954. (Thesis, U. of New Mexico) 33 AMERICIUM, ITS EARLY HISTORY AND GRAM-SCALE SEPARATION 15. E. A, Los Alamos Scientific Laboratory Report LA-1975, 1956. 16. A. , e~~£~fY! nt:! ~Qnf~ Qn Z, 355. 17. , LaMar, L. E. , 1957, ~, 327. 18. E. , 1957, ~, 286. 19. A. b~ B~giQ£b~mi~t~y Qf em~~i£iYm ~ng ~Y~iYm," National Academy of Science-NS3006, 1960. 20. H. §, 185. 21. S. Z, 138. 22. B. , 1961, ~~, 2200. ~~ em~~~ ~b~m~ §Q£~, 23.

The consequences of the resulting halffilled Sf 7 shell at Cm were originally presented by Seaborg as a test of his hypothesis. Recent research is outlined that substantiates Seaborg's predictions in new and definitive ways. Americium and curium are of historic importance in chemistry because the method used in their discovery by Seaborg, Ghiorso and coworkers furnished the first clear-cut evidence that the actinide series exists. And, as is evident in this Symposium, americium and curium are still furnishing insights into the systematics and the underlying electronic phenomena implied by the formulation of the periodic table on the basis of the actinide concept.

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