A5074326180- Radioactive element chemistry and processing
- Geological and Geochemical Analysis
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Crystal Structures and Properties
- High-pressure geophysics and materials
- Planetary Science and Exploration
- CO2 Sequestration and Geologic Interactions
- Geochemistry and Geologic Mapping
- Radioactive contamination and transfer
- Solid-state spectroscopy and crystallography
- Lanthanide and Transition Metal Complexes
- Glass properties and applications
- Clay minerals and soil interactions
- Astro and Planetary Science
- Space Exploration and Technology
- Mineralogy and Gemology Studies
- Geological Modeling and Analysis
- Hydraulic Fracturing and Reservoir Analysis
- Rock Mechanics and Modeling
- Nuclear Materials and Properties
- Crystallography and molecular interactions
- Chemical Thermodynamics and Molecular Structure
- Liver Disease Diagnosis and Treatment
- Coal Properties and Utilization
University of Tennessee at Knoxville
2016
Southern Illinois University Carbondale
2014-2015
Illinois State University
2014
University of Illinois Chicago
2012
University of Notre Dame
2004-2006
Planetary Science Institute
2003-2004
Powder X-ray diffraction shows that K- and Ca-exchanged montmorillonites swell upon interacting with CO(2) at ambient temperatures, depending on their initial hydration state. K-exchanged montmorillonite swells rapidly to a maximum d(001) of ∼12.2 Å. In contrast, more slowly, but reaches ∼15.1 Reaction kinetics differ significantly between the complexes. Expansion samples was rapid, occurring time scales tens minutes or less. The continued expand over periods up 42 h. Aging both complexes...
Abstract Amphibole in chassignite melt inclusions provides valuable information about the volatile content of original interstitial magma, but also shock and postshock processes. We have analyzed amphibole other phases from NWA 2737 inclusions, we evaluate these data along with published values to constrain crystallization Cl H 2 O effects on grains. Using a model for Cl/ OH exchange between melt, estimate primary contents amphiboles. SIMS analysis shows that currently has 0.15 wt% O. It...
Abstract Potassic‐chloro‐hastingsite has been found in melt inclusions MIL 03346, its paired stones, and NWA 5790. It is some of the most chlorine‐rich amphibole ever analyzed. In this article, we evaluate what crystal chemistry, terrestrial analogs, experiments have shown about how chlorine‐dominant (chloro‐amphibole) forms apply these insights to nakhlites. Chloro‐amphibole rare, with a dozen identified localities on Earth. always rich potassium iron poor titanium. settings, presence...
The thermal conductivity (k) of garnets is calculated from a formula originating with Debye, adapted to treat the vibrations in solid as collection damped harmonic oscillators. Our model utilizes phonon lifetimes obtained Kramers-Kronig analyses existing IR reflectivity spectra, well new data presented here, and calculates k at ambient conditions within nominal uncertainty 6% experimental values for eight natural samples well-constrained chemical compositions. Agreement good remaining...
Minerals of the amphibole group are found in igneous rocks on Earth and other rocky bodies. Since O(3) site can contain OH, O2-, F, Cl, composition provides important information about water halogen contents, oxidation state, features its formation alteration environments. However, complexity crystal chemistry means this is difficult to extract. Furthermore, it has been regular practice era electron microprobe neglect H Fe3+ analyses for amphibole, critically reducing amount available literature.
A system of structure symbols to classify and group uranyl-organic complexes is devised. The method applied describe 604 published structures complexes, then consider the complex chemistry uranyl carboxylates. review structural units in monocarboxylates, polycarboxylates mixed carboxylates provided. (U–O) equatorial bond lengths are considered for well-refined their trends briefly discussed.
Infrared reflectance, thin-film absorbance, and polarized Raman spectra were acquired from ~100 to ~4000 cm−1 polycrystalline garnets along the pyrope (Py = Mg3Al2Si3O12)-majorite [Mj Mg3(MgSi)Si3O12 ] join. We measured Py100, Mj39, Mj45, Mj80, natural single-crystal, nearly end-member pyrope. Consistency is obtained between absorption coefficients calculated through Kramers-Kronig analysis of reflectivity ( R ) data, if -values are scaled account for losses scattering. The widths lattice...
Abstract The novel compound (UO 2 ) C O 4 (OH) (H O) (UrOx2A) and the previously studied UO 3 (UrOx3) have been synthesized by mild hydrothermal methods. Single crystal diffraction data collected at 125 K using Mo α radiation a CCD-based area detector were used to solve refine structures full-matrix least-squares techniques agreement indices (UrOx2A, UrOx3) wR = 0.037, 0.049 for all data, R 1 0.015, 0.024 calculated 1285, 2194 unique reflections respectively. UrOx2A is triclinic, space group...
Abstract The novel compounds K[(UO 2 ) (C O 4 OH] · H (KUrO x ), Rb[(UO (RbUrO and Cs[(UO (CsUrO have been synthesized by mild hydrothermal methods. Single crystal diffraction data collected at 125 K using Mo α radiation a CCD-based area detector were used to solve refine the structures full-matrix least-squares techniques agreement indices , RbUrO CsUrO wR = 0.045, 0.062, 0.042 for all data, R 1 0.023, 0.030, 0.022 calculated 1834, 1863, 1821 unique reflections respectively. KUrO are...
A major concern when storing CO2 in geological formations is the sealing efficiency of lowpermeable sequences overlying potential storage reservoirs. The long-term integrity these layers (caprocks) a prerequisite to maintain place and avoid dissipative loss atmosphere. Such leakage will occur either by capillary leakage, via diffusion or through existing induced faults fractures assessment risks rates, considering different mechanisms, therefore an important issue for site approval public acceptance.