Uranyl peroxide

Uranyl peroxide
Uranyl peroxide
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.031.671 Edit this at Wikidata
EC Number
  • 234-852-1
UNII
UN number 2909
  • InChI=1S/O2.2O.U/c1-2;;;/q3*-2;+6
    Key: XFDGHOMYEXQKDC-UHFFFAOYSA-N
  • [O-2].[O-2].[O-][O-].[U+6]
Properties
UO4·nH2O
Molar mass 302.03 g/mol (as UO4)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Uranyl peroxide or uranium peroxide hydrate (UO4·nH2O) is a pale-yellow, soluble peroxide of uranium. It is found to be present at one stage of the enriched uranium fuel cycle and in yellowcake prepared via the in situ leaching and resin ion exchange system. This compound, also expressed as UO3·(H2O2)·(H2O), is very similar to uranium trioxide hydrate UO3·nH2O. The dissolution behaviour of both compounds are very sensitive to the hydration state (n can vary between 0 and 4). One main characteristic of uranium peroxide is that it consists of small needles with an average AMAD of about 1.1 μm.

The uranyl minerals studtite, UO4·4H2O, and metastudtite, UO4·2H2O, are the only minerals discovered to date found to contain peroxide. The product is a light yellow powder.