Skip to main content
U.S. Department of Energy
Office of Scientific and Technical Information

Radiation-Induced Solid-State Transformations of Uranyl Peroxides

Journal Article · · Inorganic Chemistry
Single-crystal X-ray diffraction studies of pristine and γ-irradiated Ca2[UO2(O2)3]·9H2O reveal site-specific atomic-scale changes during the solid-state progression from a crystalline to X-ray amorphous state with increasing dose. Following γ-irradiation to 1, 1.5, and 2 MGy, the peroxide group not bonded to Ca2+ is progressively replaced by two hydroxyl groups separated by 2.7 Å (with minor changes in the unit cell), whereas the peroxide groups bonded to Ca2+ cations are largely unaffected by irradiation prior to amorphization, which occurs by a dose of 3 MGy. The conversion of peroxide to hydroxyl occurs through interaction of neighboring lattice H2O molecules and ionization of the peroxide O–O bond, which produces two hydroxyls, and allows isolation of the important monomer building block, UO2(O2)2(OH)24–, that is ubiquitous in uranyl capsule polyoxometalates. Steric crowding in the equatorial plane of the uranyl ion develops and promotes transformation to an amorphous phase. In contrast, γ-irradiation of solid Li4[(UO2)(O2)3]·10H2O results in a solid-state transformation to a well-crystallized peroxide-free uranyl oxyhydrate containing sheets of equatorial edge and vertex-sharing uranyl pentagonal bipyramids with likely Li and H2O in interlayer positions. The irradiation products of these two uranyl triperoxide monomers are compared via X-ray diffraction (single-crystal and powder) and Raman spectroscopy, with a focus on the influence of the Li+ and Ca2+ countercations. Highly hydratable and mobile Li+ yields to uranyl hydrolysis reactions, while Ca2+ provides lattice rigidity, allowing observation of the first steps of radiation-promoted transformation of uranyl triperoxide.
Research Organization:
Univ. of Notre Dame, IN (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
FC02-04ER15533; NA0003763
OSTI ID:
1838189
Journal Information:
Inorganic Chemistry, Journal Name: Inorganic Chemistry Journal Issue: 2 Vol. 61; ISSN 0020-1669
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

References (41)

Actinyl Peroxide Nanospheres journal March 2005
High Uptake of ReO 4 and CO 2 Conversion by a Radiation-Resistant Thorium-Nickle [Th 48 Ni 6 ] Nanocage-Based Metal-Organic Framework journal March 2019
Isolation and Reactivity of Uranyl Superoxide journal June 2021
Uranyl–Peroxide Capsule Self‐Assembly in Slow Motion journal February 2019
The U28 Nanosphere: What's Inside? journal March 2011
Raman spectroscopic study of the uranyl mineral, compreignacite, K 2 [(UO 2 ) 3 O 2 (OH) 3 ] 2 ·7H 2 O journal September 2008
Radiation-induced solid-state polymerization of ring compounds journal April 1962
Radiation-induced solid state polymerization journal January 1962
Materials challenges in nuclear energy journal February 2013
Detection and identification of solids, surfaces, and solutions of uranium using vibrational spectroscopy journal November 2018
Progress toward Solid State Synthesis by Design journal October 2018
Linker Contribution toward Stability of Metal–Organic Frameworks under Ionizing Radiation journal November 2021
Computationally-Guided Assignment of Unexpected Signals in the Raman Spectra of Uranyl Triperoxide Complexes journal January 2017
Energetic Trends in Monomer Building Blocks for Uranyl Peroxide Clusters journal December 2018
Stability of Solid Uranyl Peroxides under Irradiation journal September 2019
Stability of Studtite in Aqueous Suspension: Impact of HCO 3 and Ionizing Radiation on the Dynamics of Dissolution journal December 2019
Expanding the Crystal Chemistry of Uranyl Peroxides:  Synthesis and Structures of Di- and Triperoxodioxouranium(VI) Complexes journal April 2007
Self-Assembly of Alkali-Uranyl-Peroxide Clusters journal September 2010
Raman Spectroscopic and ESI-MS Characterization of Uranyl Peroxide Cage Clusters journal January 2014
Elucidating Self-Assembly Mechanisms of Uranyl–Peroxide Capsules from Monomers journal September 2014
Dynamics of Uranyl Peroxide Nanocapsules journal November 2012
Unprecedented Radiation Resistant Thorium–Binaphthol Metal–Organic Framework journal July 2020
Solid-State Phase Transformation and Self-Assembly of Amorphous Nanoparticles into Higher-Order Mineral Structures journal June 2020
Facile Oxide to Chalcogenide Conversion for Actinides Using the Boron–Chalcogen Mixture Method journal July 2020
Single-Crystal-to-Single-Crystal [2 + 2] Photocycloaddition Reaction in a Photosalient One-Dimensional Coordination Polymer of Pb(II) journal November 2020
Unusual Metal–Organic Framework Topology and Radiation Resistance through Neptunyl Coordination Chemistry journal October 2021
Multistep Solid-State Organic Synthesis of Carbamate-Linked Covalent Organic Frameworks journal June 2019
A transient liquid-like phase in the displacement cascades of zircon, hafnon and thorite journal September 1998
Single-crystal-to-single-crystal intercalation of a low-bandgap superatomic crystal journal August 2017
99TcO4− removal from legacy defense nuclear waste by an alkaline-stable 2D cationic metal organic framework journal November 2020
Captivation with encapsulation: a dozen years of exploring uranyl peroxide capsules journal January 2018
The lithium–water configuration encapsulated by uranyl peroxide cage cluster U 24 journal January 2019
Formation of calcium carbonate particles by direct contact of Ca(OH)2 powders with supercritical CO2 journal January 2006
The crystal and molecular structure of sodium uranyl triperoxide journal January 1968
Nuclear waste disposal—pyrochlore (A2B2O7): Nuclear waste form for the immobilization of plutonium and “minor” actinides journal June 2004
Radiation Induced Solid-State Polymerization of Acetylenedicarboxylic acid journal May 2002
Solid-State Chemistry: A A Rediscovered Chemical Frontier journal February 1990
Turning Down the Heat: Design and Mechanism in Solid-State Synthesis journal March 1993
Synthesis, crystallographic characterization, and conformational prediction of a structurally unique molecular mixed-ligand U(VI) solid, Na6[UO2(O2)2(OH)2](OH)2·14H2O journal January 2008
The radiation-induced crystalline-to-amorphous transition in zircon journal March 1994
Radiation effects in crystalline ceramics for the immobilization of high-level nuclear waste and plutonium journal June 1998


Similar Records

Neptunyl Peroxide Chemistry: Synthesis and Spectroscopic Characterization of a Neptunyl Triperoxide Compound, Ca2[NpO2(O2)3]·9H2O
Journal Article · Sun Aug 25 20:00:00 EDT 2019 · Inorganic Chemistry · OSTI ID:1561852

Solid-state transformation of uranyl peroxide materials through high-level irradiation
Technical Report · Wed Nov 15 23:00:00 EST 2023 · OSTI ID:2377310

Solid-State Transformation of Uranyl Peroxide Materials through High-Level Irradiation
Journal Article · Wed Nov 15 19:00:00 EST 2023 · Inorganic Chemistry · OSTI ID:2221776