Stability of Peroxide-Containing Uranyl Minerals

Karrie Ann Hughes Kubatko, Katheryn B. Helean, Alexandra Navrotsky, Peter C. Burns

Research output: Contribution to journalArticlepeer-review

168 Scopus citations

Abstract

Minerals containing peroxide are limited to studtite, (UO 2)O2(H2O)4, and meta-studtite, (UO2)O2(H2O)2. High-temperature oxide-melt solution calorimetry and solubility measurements for studtite (standard enthalpy of formation at 298 kelvin is -2344.7 ± 4.0 kilojoules per mole from the elements) establishes that these phases are stable in peroxide-bearing environments, even at low H2O2 concentrations. Natural radioactivity in a uranium deposit, or the radioactivity of nuclear waste, can create sufficient H2O 2 by alpha radiolysis of water for studtite formation. Studtite and metastudtite may be important alteration phases of nuclear waste in a geological repository and of spent fuel under any long-term storage, possibly at the expense of the commonly expected uranyl oxide hydrates and uranyl silicates.

Original languageEnglish (US)
Pages (from-to)1191-1193
Number of pages3
JournalScience
Volume302
Issue number5648
DOIs
StatePublished - Nov 14 2003
Externally publishedYes

ASJC Scopus subject areas

  • General

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