Surface chemistry of Pu oxides

Plutonium uptake by brucite and hydroxylated periclase

“…Binding energies measured on two different Pu(IV) colloid preparations [11] were higher than those expected for the dioxide, closer to those observed for Pu(OH) 4 or PuO 2+x . The apparent reduction of the surface may be an artifact of the analysis technique.…”

“…Atomic concentration estimates were based on sensitivity factors appropriate for the instrumental conditions and analyzer design. The binding energy values and sensitivity factor used for the Pu 4f region were based on data derived from known Pu compounds, including PuO 2 [10], Pu(OH) 4 [11] and PuF 4 [12]. X-ray absorption near-edge structure (XANES) was used for determining the oxidation state of Pu in the materials.…”

Reaction of neptunium with molecular and atomic oxygen: Formation and stability of surface oxides

“…Other chemisorbed oxygen species like hydroxylic groups, showing similar O-1s binding energies as that found for the shoulder in our spectra ($531 eV [19,36]), can be ruled out because their characteristic UPS emissions are missing. If only the main (oxidic) peak for O-1s is taken into account for the calculation of the O/Np ratios, values around 2.5 were obtained (the area of the fitted shoulder varied between 7% and 12% of the total peak area).…”

Literature Review of Puo2 Calcination Time and Temperature Data for Specific Surface Area

“…This reference 21 examines the surface chemistry of Pu(IV) compounds including PuO 2 and Pu(OH) 4 . The different Pu oxidation states are discussed and the impact of temperature on them.…”