Plutonium hydride
| Plutonium hydride | |
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Plutonium dihydride |
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Plutonium(2+) hydride |
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Other names
Plutonium dihydride Plutonium(II) hydride |
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| Identifiers | |
| CAS number | 17336-52-6  |
| Jmol-3D images | Image 1 |
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| Properties | |
| Molecular formula | H2Pu |
| Molar mass | 246.08 g mol−1 |
| Exact mass | 246.016 g mol-1 |
| Appearance | Black, opaque crystals |
 (verify) (what is:  / ?)Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) |
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| Infobox references | |
Plutonium hydride is the chemical compound with the formula PuH2. It is one of two characterised hydrides of plutonium, the other is PuH3.[1] PuH2 is non-stoichiometric with a composition range of PuH2 – PuH2.7. Additionally metastable stoichiometries with an excess of hydrogen (PuH2.7 – PuH3) can be formed.[1] PuH2 has a cubic structure. It is readily formed from the elements at 1 atmosphere at 100–200 °C:[1]
- Pu + H2 → PuH2
Studies of the reaction of plutonium metal with moist air at 200–350 °C showed the presence of cubic plutonium hydride on the surface along with Pu2O3, PuO2 and a higher oxide identified by X-ray diffraction and X-ray photoelectron spectroscopy as the mixed-valence phase PuIV3−xPuVIxO6+x.[2] Investigation of the reaction performed without heating suggests that the reaction of Pu metal and moist air the production of PuO2 and a higher oxide along with adsorbed hydrogen, which catalytically combines with O2 to form water.[3]
Plutonium dihydride on the surface of hydrided plutonium acts as a catalyst for the oxidation of the metal with consumption of both O2 and N2 from air.[4]
[edit] References
- ^ a b c Gerd Meyer, 1991, Synthesis of Lanthanide and Actinide Compounds Springer, ISBN 0-79231018-7.
- ^ J. L. Stakebake, D. T. Larson, J. M. Haschke: Characterization of the Plutonium-water Reaction II: Formation of a Binary Oxide containing Pu(VI), Journal of Alloys and Compounds, 202, 1–2, 1993, 251–263, doi:10.1016/0925-8388(93)90547-Z.
- ^ J. M. Haschke, T. H. Allen, L. A. Morales: Surface and Corrosion Chemistry of Plutonium, Los Alamos Science, 2000, 252.
- ^ John M. Haschke Thomas H. Allen: Plutonium Hydride, Sesquioxide and Monoxide Monohydride: Pyrophoricity and Catalysis of Plutonium Corrosion, Journal of Alloys and Compounds, 320, 1, 2001, 58–71, doi:10.1016/S0925-8388(01)00932-X.
[edit] See also
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