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Uranyl peroxide nanoclusters at high-pressure

Published online by Cambridge University Press:  14 August 2017

Katlyn M. Turner*
Affiliation:
Department of Geological Sciences, Stanford University, Stanford, California 94305, USA
Jennifer E.S. Szymanowski
Affiliation:
Department of Civil & Environmental Engineering & Earth Sciences, University of Notre Dame, Notre Dame, Indiana 46556, USA
Fuxiang Zhang
Affiliation:
Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
Yu Lin
Affiliation:
Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
Brendan T. McGrail
Affiliation:
Department of Civil & Environmental Engineering & Earth Sciences, University of Notre Dame, Notre Dame, Indiana 46556, USA
Wendy L. Mao
Affiliation:
Department of Geological Sciences, Stanford University, Stanford, California 94305, USA; and Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
Peter C. Burns
Affiliation:
Department of Civil & Environmental Engineering & Earth Sciences and Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, USA
Rodney C. Ewing
Affiliation:
Department of Geological Sciences, Stanford University, Stanford, California 94305, USA
*
a) Address all correspondence to this author. e-mail: katlynmt@stanford.edu
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Abstract

U60 ([UO2(O2)(OH)]60 60− in water) is a uranyl peroxide nanocluster with a fullerene topology and O h symmetry. U60 clusters can exist in crystalline solids or in liquids; however, little is known of their behavior at high pressures. We compressed the U60-bearing material: Li68K12(OH)20[UO2(O2)(OH)]60(H2O)310 ( $Fm\bar 3$ ; a = 37.884 Å) in a diamond anvil cell to determine its response to increasing pressure. Three length scales and corresponding structural features contribute to the compression response: uranyl peroxide bonds (<0.5 nm), isolated single nanoclusters (2.5 nm), and the long-range periodicity of nanoclusters within the solid (>3.7 nm). Li68K12(OH)20[UO2(O2)(OH)]60(H2O)310 transformed to a tetragonal structure below 2 GPa and irreversibly amorphized between 9.6 and 13 GPa. The bulk modulus of the tetragonal U60-bearing material was 25 ± 2 GPa. The pressure-induced amorphous phase contained intact U60 clusters, which were preserved beyond the loss of long-range periodicity. The persistence of U60 clusters at high pressure may have been enhanced by the interaction between U60 nanoclusters and the alcohol pressure medium. Once formed, U60 nanoclusters persist regardless of their associated long-range ordering—in crystals, amorphous solids, or solutions.

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Copyright
Copyright © Materials Research Society 2017 

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