Magnetic investigations on alkaline earth oxo-neptunates(IV)

Actinide Organometallic Chemistry

“…As a consequence, 18 and 19 are precursors for some of the chemically most reactive and versatile organoactinides prepared to date. (6) (20,21) have also been intensively investigated (17,18,31). Not (7) only does the large size of the actinide ion facilitate high formal coordination numbers, but a unique interaction can occur between the highest occupied C8H8-2 molecular orbital (e2.)…”

“…For the heavier actinides, the 5forbitals are far more contracted and the bonding is distinctly lanthanide-like (ionic). 20 21 10 SEPTEMBER 1982 (10) M =Th,Pa,Np,U,Pu extensive series of ring-functionalized complexes can be prepared by this pathway, starting with substituted cyclooctatetraenes (31). Trivalent complexes of heavier actinides are also accessible (Eq.…”

Thermodynamic investigation of Na2U2O7 using Knudsen effusion mass spectrometry and high temperature X-ray diffraction

“…From safety perspectives, it is essential to have a thorough knowledge of the chemistry of the nuclear fuel-sodium coolant interaction as the two might come into contact in the event of a breach of the stainless steel cladding. (U, Pu) O 2 mixed oxide fuel is currently the preferred option for SFRs, and as such, the structural [1,2], thermodynamic [3][4][5][6][7][8], magnetic [9][10][11], and spectroscopic [12][13][14][15][16][17][18][19] properties of the Na-U-O and Na-Pu-O ternary compounds have been investigated in the past. The potential products of interaction are numerous: (Na 3 UO 4 , NaUO 3 , Na 2 UO 4 , Na 4 UO 5 ,Na 2 U 2 O 7 , Na 6 U 7 O 24 ) [20][21][22][23]1,24,25], and (Na 2 PuO 3 , Na 3 PuO 4 , Na 6 PuO 5 , Na 4 Pu 2 O 5 , Na 4 PuO 5 , Na 5 PuO 6 ) [1,2,26] for the first and second systems, respectively, but not all well characterized.…”

X-ray Diffraction, Mössbauer Spectroscopy, Magnetic Susceptibility, and Specific Heat Investigations of Na4NpO5 and Na5NpO6

“…As for the hypothesis of a Γ 7 t or Γ 6 t doublet lying 14 cm –1 above the Γ 7 ground state, it would require a complete reevaluation of the spectroscopic data and calculations of Bickel et al, , according to which the Γ 7 ground state is well-isolated . Indeed, Bickel et al performed electronic spectroscopy on Na 4 NpO 5 at 77 K, and reported four bands in the near-infrared region at 5910, 7225, 8375, and 10 124 cm –1 , which they assigned to the Γ 7 t and Γ 6 t levels, and two nearest doublets of the 2 F 7/2 levels (Γ 7 ′ and Γ 6 t′ ).…”