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Odoh SO, Shamblin J, Colla CA, et al. Structure and Reactivity of X-ray Amorphous Uranyl Peroxide, U2O7. Inorg Chem. 2016;55(7):3541-6doi: 10.1021/acs.inorgchem.6b00017.
Odoh, S. O., Shamblin, J., Colla, C. A., Hickam, S., Lobeck, H. L., Lopez, R. A., Olds, T., Szymanowski, J. E., Sigmon, G. E., Neuefeind, J., Casey, W. H., Lang, M., Gagliardi, L., & Burns, P. C. (2016). Structure and Reactivity of X-ray Amorphous Uranyl Peroxide, U2O7. Inorganic chemistry, 55(7), 3541-6. https://doi.org/10.1021/acs.inorgchem.6b00017
Odoh, Samuel O, et al. "Structure and Reactivity of X-ray Amorphous Uranyl Peroxide, U2O7." Inorganic chemistry vol. 55,7 (2016): 3541-6. doi: https://doi.org/10.1021/acs.inorgchem.6b00017
Odoh SO, Shamblin J, Colla CA, Hickam S, Lobeck HL, Lopez RA, Olds T, Szymanowski JE, Sigmon GE, Neuefeind J, Casey WH, Lang M, Gagliardi L, Burns PC. Structure and Reactivity of X-ray Amorphous Uranyl Peroxide, U2O7. Inorg Chem. 2016 Apr 04;55(7):3541-6. doi: 10.1021/acs.inorgchem.6b00017. Epub 2016 Mar 14. PMID: 26974702.
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Inorg Chem. 2016 Apr 04;55(7):3541-6. doi: 10.1021/acs.inorgchem.6b00017. Epub 2016 Mar 14.

Structure and Reactivity of X-ray Amorphous Uranyl Peroxide, U2O7.

Inorganic chemistry

Samuel O Odoh, Jacob Shamblin, Christopher A Colla, Sarah Hickam, Haylie L Lobeck, Rachel A K Lopez, Travis Olds, Jennifer E S Szymanowski, Ginger E Sigmon, Joerg Neuefeind, William H Casey, Maik Lang, Laura Gagliardi, Peter C Burns

Affiliations

  1. University of Minnesota , Department of Chemistry, Minnesota Supercomputing Institute, Minneapolis, Minnesota 55455, United States.
  2. Department of Nuclear Engineering, University of Tennessee , Knoxville, Tennesee 37996, United States.
  3. Department of Earth and Planetary Sciences, Department of Chemistry; University of California , Davis, California 95616, United States.
  4. Department of Civil and Environmental Engineering and Earth Sciences, University of Notre Dame , Notre Dame, Indiana 46556, United States.
  5. Chemical and Engineering Materials Division, Oak Ridge National Laboratory , Oak Ridge, Tennessee 37831, United States.
  6. Department of Chemistry and Biochemistry, University of Notre Dame , Notre Dame, Indiana 46556, United States.

PMID: 26974702 DOI: 10.1021/acs.inorgchem.6b00017

Abstract

Recent accidents resulting in worker injury and radioactive contamination occurred due to pressurization of uranium yellowcake drums produced in the western U.S.A. The drums contained an X-ray amorphous reactive form of uranium oxide that may have contributed to the pressurization. Heating hydrated uranyl peroxides produced during in situ mining can produce an amorphous compound, as shown by X-ray powder diffraction of material from impacted drums. Subsequently, studtite, [(UO2)(O2)(H2O)2](H2O)2, was heated in the laboratory. Its thermal decomposition produced a hygroscopic anhydrous uranyl peroxide that reacts with water to release O2 gas and form metaschoepite, a uranyl-oxide hydrate. Quantum chemical calculations indicate that the most stable U2O7 conformer consists of two bent (UO2)(2+) uranyl ions bridged by a peroxide group bidentate and parallel to each uranyl ion, and a μ2-O atom, resulting in charge neutrality. A pair distribution function from neutron total scattering supports this structural model, as do (1)H- and (17)O-nuclear magnetic resonance spectra. The reactivity of U2O7 in water and with water in air is higher than that of other uranium oxides, and this can be both hazardous and potentially advantageous in the nuclear fuel cycle.

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