Untitled

Higher Oxidation States of Americium: Preparation, Characterization and Use for Separations

“…More exotic synthesis reactions involve noble gas compounds. Drobyshevskii and co-workers showed that the reaction of KrF 2 with AmF 3 in anhydrous HF yields a dark-brown solid of AmF 6 with a vapor pressure that is similar to that of UF 6 . The Xe(VIII)-containing sodium perxenate, Na 4 XeO 6 , has an oxidation potential of about 3 V and has been used to prepare Am(VI) in dilute nitric acid.…”

“…Drobyshevskii and co-workers showed that the reaction of KrF 2 with AmF 3 in anhydrous HF yields a dark-brown solid of AmF 6 with a vapor pressure that is similar to that of UF 6 . 76 The Xe(VIII)-containing sodium perxenate, Na 4 XeO 6 , has an oxidation potential of about 3 V and has been used to prepare Am(VI) in dilute nitric acid. Holcomb found that the addition of silver improved the yields most likely because of the capacity of silver ions to maintain Am(VI) after its oxidation by Xe(VIII).…”

Americium

“…Drobyshevskii et al (1980) reported generating a solid by reaction of AmF 3 with KrF 2 in anhydrous HF and inferred its composition to be AmF 6 based upon its volatility, IR spectrum, and hydrolysis to AmO 2þ 2 ; the IR absorption band at 604 AE 3 cm À1 is expected for the n 3 mode of AmF 6 . Fargeas et al (1986) also inferred the existence of AmF 6 in their experiments from thermochromatography data.…”

“…The reaction of KrF 2 with AmF 3 in anhydrous HF yields a dark-brown solid of AmF 6 with a vapor pressure that is similar to that of UF 6 (Drobyshevskii et al, 1980). (6) Am(VII): While attempts to synthesize Am(VII) from Li 2 O-AmO 2 mixtures at 300-400 C failed, oxidation of 3-4 M NaOH solutions containing 0.001-0.002 M Am(VI) with ozone at 0-7 C yields a green-colored solution of Am(VII) (Krot et al, 1974a,b;Myasoedov and Kremliakova, 1985 (Krot et al, 1974a,b).…”

Periodic trends in trivalent actinide halides, phosphates, and arsenates

“…2,7 Halides of actinides have been synthesized in the past. 16 Uranium hexafluoride [17][18][19][20][21][22][23][24][25][26] and plutonium hexafluoride [27][28][29][30][31] probably are the most studied actinide halides due to their importance in the enrichment of fission material for nuclear applications. [32][33][34] Few reports on actinide phosphates and arsenates, mainly focussing on uranium compounds [35][36][37][38][39] and/ or pre-uranium compounds [40][41][42][43][44][45][46] are available in the literature.…”