Topic
Plutonium(IV) oxide
About: Plutonium(IV) oxide is a research topic. Over the lifetime, 4 publications have been published within this topic receiving 97 citations.
Papers
TL;DR: The solubility products of amorphous Pu(OH)4 and crystalline P u 0 2 have been determined in 1 M HC10 4. The dissolution equilibrium of the hydroxide attained after 45 days is characterized by spectroscopy as mentioned in this paper.
Abstract: The solubility products of amorphous Pu(OH)4 and crystalline P u 0 2 have been determined in 1 M HC10 4 . The dissolution equilibrium of the hydroxide attained after 45 days is characterized by spectroscopy. The oxide prepared at 900 °C is equilibrated for 3 years and the solution is speciated by spectroscopy as well as TTA extraction, both of which give comparable results. The solubility products of the hydroxide and oxide are found to be log Ksp= 5 7 . 8 5 ± 0.05 and 6 0 . 2 0 + 0.17, respectively. The free energy of formation for Pu(OH)4(am) is calculated to be —1141 kJ m o l 1 ·
71 citations
TL;DR: It was shown that as the plutonium colloids age they do in fact shrink in size, contrary to previous expectations, and with a structure very similar to solid plutonium(IV) oxide, but with somewhat shorter mean Pu-O bond and Pu···Pu distances indicating a partial oxidation.
Abstract: The behavior of plutonium still puzzles scientists 70 years after its discovery. There are several factors making the chemistry of plutonium interesting including its ability to keep several oxidation states. Another unique property is that the oxidation states +III, +IV, +V and +VI may exist simultaneously in solution. Another property plutonium shares with some other tetravalent metal ions is the ability to form stable polynuclear complexes or colloids. The structures of freshly prepared and five-year old plutonium(IV) colloids are compared with crystalline plutonium(IV) oxide using Pu L3-edge EXAFS. It was shown that as the plutonium colloids age they do in fact shrink in size, contrary to previous expectations. The aged colloidal particles are indeed very small with only 3–4 plutonium atoms, and with a structure very similar to solid plutonium(IV) oxide, but with somewhat shorter mean Pu–O bond and Pu⋯Pu distances indicating a partial oxidation. The very small size of the colloidal particles is further supported by the fact that they do not sediment on heavy ultra-centrifugation.
38 citations
5 citations
TL;DR: In this article, the authors examined the internal chemical reaction mechanism and the activation energy for the surface mobility reaction on CeO 2 and showed that exposure to high temperatures induces a reduction in the specific surface area, which could cause a dynamic change in exchange rate and mechanism during experimentation.
5 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2015 | 1 |
| 2014 | 1 |
| 2013 | 1 |
| 1989 | 1 |