A5102815971- Nuclear Materials and Properties
- Radioactive element chemistry and processing
- Radiation Detection and Scintillator Technologies
- Nuclear reactor physics and engineering
- Nuclear materials and radiation effects
- Nuclear Physics and Applications
- Microwave Dielectric Ceramics Synthesis
- Ferroelectric and Piezoelectric Materials
- Advanced Semiconductor Detectors and Materials
- Rare-earth and actinide compounds
- High-pressure geophysics and materials
- Multiferroics and related materials
- Radiation Shielding Materials Analysis
- Luminescence Properties of Advanced Materials
U.S. Air Force Institute of Technology
2013-2022
Wright-Patterson Air Force Base
2013-2022
Wyle (United States)
2019
United States Air Force Research Laboratory
2019
University of Nebraska–Lincoln
2019
Leibniz Institute of Polymer Research
2019
Band-to-band transition energy parameters for single-crystal actinide samples of uranium oxide and thorium were determined compared using spectroscopic ellipsometry critical-point dielectric function analyses. Spectroscopic measurements from the near-infrared to vacuum ultraviolet spectral region used determine functions oxide. The structure is similar between UO2 ThO2 but strongly blue shifted ThO2. We find bandgap energies 2.1 eV 5.4 ThO2, respectively.
We find Mn surface segregation for single crystals of doped Li2B4O7, nominally Li1.95Mn0.05B4O7(001), but as the temperature increases, evidence this diminishes significantly. At room temperature, photovoltaic charging is significant pyroelectric material quenched at a well below that seen undoped Li2B4O7 samples. The suppression in region 120 °C accompanies dissolution bulk i.e., reversal (215 °C), suggests along (001) direction, ionic transport must be considered significant.
The infrared-active phonon modes, in single-crystal samples of thorium dioxide (ThO2) and uranium (UO2), were investigated using spectroscopic ellipsometry compared with density functional theory. Both ThO2 UO2 are found to have one mode pair [consisting transverse optic (TO) associated longitudinal (LO) mode], which is responsible for the dominant features ellipsometric data. At room temperature, our results pair’s resonant frequencies broadening parameters comparable previous reflectance...
The interband transitions of urania (UO2) are validated independently through cathode luminescence UO2. A picture emerges consistent with density functional theory. While theory is generally experiment, it evident that the choice can significantly alter band gap and some details structure, in particular at conduction minimum. Strictly ab initio predictions optical properties actinide compounds, based on alone continues to be somewhat elusive.
The interband transitions of UO 2 are validated independently through cathode luminescence. A picture emerges consistent with density functional theory. While theory is generally experiment, it evident from the comparison and ThO that choice can significantly alter bandgap some details band structure, in particular at conduction minimum. Strictly ab initio predictions optical properties actinide compounds, based on alone, continue to be somewhat elusive.
The effective Debye temperature ( ) of the surface a single crystal U 0.71 Th 0.79 O 2 alloy prepared by hydrothermal synthesis is obtained from temperature‐dependent X‐ray photoemission in range 300–623 K. average determined to be 217 ± 24 fluorescence (XRF) spectroscopy confirms crystal's composition as . Photoemission reveals both thorium and uranium 4f states, which includes 4+ oxidation states. alloy, measured via photoemission, lower than urania or thoria literature values, indicating...