The formation and stability of [EuP{sub 5}W{sub 30}O{sub 110}]{sup 12-} and [AmP{sub 5}W{sub 30}O{sub 110}]{sup 12-.

Journal Article · Sat Jan 01 04:00:00 EST 2000 · J. Alloys Compd.

DOI:https://doi.org/10.1016/S0925-8388(00)00637-X· OSTI ID:942727

Williams, C W; Antonio, M R; Soderholm, L

A comparison of the standard reduction potentials of Eu{sup 3+} and Am{sup 3+}, as well as their similar ionic radii, suggest that Am in the Preyssler anion, [AmP{sub 5}W{sub 30}O{sub 110}]{sup 12-}, may be reduced under an applied potential. However, cyclic voltammetric studies performed in a noncomplexing electrolyte, together with XANES and EXAFS data, consistently demonstrate that Am is trivalent when encrypted in [AmP{sub 5}W{sub 30}O{sub 110}]{sup 12-}. There is no evidence of Am{sup 3+} reduction, even at the lowest potentials probed. A comparison of bond distances of the trivalent Am analog, determined from EXAFS spectroscopy, with those of other tetravalent f ions shows a correlation with ionic radii that appears independent of the charge on the ion.

• Research Organization: Argonne National Laboratory (ANL)
• Sponsoring Organization: SC
• DOE Contract Number: AC02-06CH11357
• OSTI ID: 942727
• Report Number(s): ANL/CHM/JA-34040
• Journal Information: J. Alloys Compd., Journal Name: J. Alloys Compd. Journal Issue: 2000 Vol. 303-304; ISSN 0925-8388; ISSN JALCEU
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

36 MATERIALS SCIENCE
AMERICIUM COMPOUNDS
CHARGES
CORRELATIONS
EUROPIUM COMPOUNDS
IONS
PHOSPHORUS COMPOUNDS
POTENTIALS
REDUCTION
SPECTROSCOPY
STABILITY