A5019071258- High-pressure geophysics and materials
- Diamond and Carbon-based Materials Research
- Advanced Chemical Physics Studies
- Superconductivity in MgB2 and Alloys
- Spectroscopy and Laser Applications
- Software System Performance and Reliability
- Electronic Packaging and Soldering Technologies
- Force Microscopy Techniques and Applications
- Geological and Geochemical Analysis
- Physics of Superconductivity and Magnetism
- X-ray Diffraction in Crystallography
- Advanced Physical and Chemical Molecular Interactions
- Nuclear and radioactivity studies
- Risk and Safety Analysis
- Laser Design and Applications
- X-ray Spectroscopy and Fluorescence Analysis
- Graphite, nuclear technology, radiation studies
- Geophysics and Sensor Technology
- Solid State Laser Technologies
University of Nevada, Las Vegas
2018-2024
Carbon concentration greatly influences structural and electronic properties of carbonaceous sulfur hydride, almost halving the pressure required for high-TC superconductivity.
The lattice dynamic response of body-centered tetragonal $\ensuremath{\beta}\text{\ensuremath{-}}\mathrm{Sn}$ $(I{4}_{1}/amd)$ under high-pressure and -temperature conditions is determined using experimental optical vibration modes. Raman scattering used to map the phase stability region perform mode Gr\"uneisen analysis, we demonstrate necessity an intensity calibration for thermometry. tensor evaluated along a set isotherms address shortcomings single-mode parameters with respect...
The employment of high-pressure gases as a pressure-transmitting medium, sample, or reactant for diamond anvil cell experiments is widespread. As pressure transmitter, are crucial to forming quasi-hydrostatic compression atmospheres samples inside the uniaxially driven cell. We describe an optical design high-resolution images gasket and sample chamber under high gas pressures in loading apparatus. Our simple, low-cost, may be easily adapted suit apparatus any design, well other common...
High pressure-temperature conditions can be readily achieved through the laser-heated diamond anvil cell (LH-DAC). A stable laser source is required for reliable in situ measurements of sample, as sample small with a thermal time constant order microseconds. Here, we show that power instabilities typical CO2 gas lasers used LH-DAC's are ±5% at second timescale and ∼±50% microsecond timescale. We also demonstrate pointing instability requires either diffuser or an integrating sphere total...
We present a portable CO2 laser heating system for in situ x-ray absorption spectroscopy (XAS) studies at 16-BM-D (High Pressure Collaborative Access Team, Advanced Photon Source, Argonne National Laboratory). Back scattering optical measurements are made possible by the implementation of Ge beamsplitter. Optical pyrometry is conducted near-infrared, and our temperature free chromatic aberration due to peak-scaling method [A. Kavner W. R. Panero, Phys. Earth Planet. Inter. 143–144, 527–539...
The uniaxial compression design of the diamond anvil high pressure cell (DAC) necessitates use a soft pressure-transmitting medium (PTM) to minimize non-hydrostatic effects at significantly pressures, and many such media are gaseous ambient conditions. There now exist number commercially-available instruments - high-pressure gas loading apparatus for insertion gases into up several kbar. These machines allow as PTM, reagent chemistry, or be loaded sample material itself. We present...