Journal ArticleDOI
Laser and X-ray spectroscopic studies of uranium-calcite interface phenomena
TLDR
In this paper, the interatomic uranium-oxygen distances of reaction products at the mineral surface were determined using extended X-ray absorption fine structure (EXAFS) spectroscopy.About:
This article is published in Journal of Nuclear Materials.The article was published on 1997-09-01. It has received 55 citations till now. The article focuses on the topics: Uranyl & Perchlorate.read more
Citations
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Journal ArticleDOI
Mineral–Water Interface Reactions of Actinides
Journal ArticleDOI
Uranyl Incorporation into Calcite and Aragonite: XAFS and Luminescence Studies
TL;DR: In this paper, X-ray absorption, luminescence, and Raman spectroscopic studies of U(VI)-containing calcite and aragonite have been performed to show that the U ion, the dominant and mobile form of dissolved uranium in near-surface waters, has a disordered and apparently less stable coordination environment when incorporated into calcite.
Journal ArticleDOI
Structure and reactivity of the calcite–water interface
Frank Heberling,Thomas P. Trainor,Johannes Lützenkirchen,Peter J. Eng,Melissa A. Denecke,Dirk Bosbach +5 more
TL;DR: A Basic-Stern surface complexation model is developed to model observed zetapotentials, while only considering outer-sphere complexes of ions other than protons and hydroxide, which gives reasonable values for the inner Helmholtz capacitance, in line with the Stern layer thickness estimated from surface diffraction results.
Journal ArticleDOI
Coprecipitation of Uranium(VI) with Calcite: XAFS, micro-XAS, and luminescence characterization
Richard J. Reeder,Melissa Nugent,C. Drew Tait,David E. Morris,Steve M. Heald,Kenneth M. Beck,Wayne P. Hess,A. Lanzirotti +7 more
TL;DR: In this article, X-ray absorption and luminescence spectroscopies have been used to characterize the local structure and coordination of uranium(VI) species coprecipitated with calcite (CaCO3) from room-temperature aqueous solutions.
Journal ArticleDOI
Uranyl Incorporation in Natural Calcite
Shelly D. Kelly,Matthew Newville,L. Cheng,Kenneth M. Kemner,Stephen R. Sutton,Paul Fenter,Neil C. Sturchio,Christoph Spötl +7 more
TL;DR: In this paper, X-ray absorption spectroscopy and microprobe studies of uranium in relatively U-rich ∼13,700-year-old calcite from a speleothem in northernmost Italy indicate substitution of uranyl for a calcium and two adjacent carbonate ions in calcite.
References
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Journal ArticleDOI
Ab initio curved-wave x-ray-absorption fine structure.
TL;DR: An automated code has been developed, in which curved-wave effects are treated exactly in terms of effective backscattering amplitudes, inelastic losses and self-energy shifts are incorporated with use of a Hedin-Lundqvist self- energy, an automated relativistic overlapping-atom muffin-tin potential is used, and the energy threshold is estimated from electron-gas theory.
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Structure and bonding environments at the calcite surface as observed with X-ray photoelectron spectroscopy (XPS) and low energy electron diffraction (LEED)
TL;DR: In this paper, the exact electron binding energies for the atoms in calcite were determined with XPS using the gold dot method, and the results are 290.1 ± 0.1 eV for C1s, 347.7 and 351.2 ± 1.15 eV respectively.
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Speciation of uranium in seepage waters of a mine tailing pile studied by time-resolved laser-induced fluorescence spectroscopy (trlfs)
TL;DR: In this article, a time-resolved laser-induced fluorescence spectroscopy (TRLFS) was used to investigate the chemical speciation of U(VI) in natural seepage water and corresponding model solutions.