by carscat | Jan 12, 2021 | Science Highlights
Elastic moduli (Cij) of single-crystal stishovite and post-stishovite are determined using Brillouin light scattering, impulsive stimulated light scattering, and x-ray diffraction up to 70 GPa. The C12 of stishovite converges with the C11 at ∼55 GPa, where the...
by carscat | Jan 12, 2021 | Science Highlights
Alloys between Mg3Sb2 and Mg3Bi2 have recently been shown to be exceptional thermoelectric materials due in part to their anomalously low thermal conductivity. In the present study, in situ high-pressure synchrotron X-ray diffraction was used to investigate the...
by carscat | Jan 11, 2021 | Science Highlights
Following the discovery of high-temperature superconductivity in the La–H system, we studied the formation of new chemical compounds in the barium-hydrogen system at pressures from 75 to 173 GPa. Using in situ generation of hydrogen from NH3BH3, we synthesized...
by carscat | Jan 11, 2021 | Science Highlights
Here, we present new measurements of the phase stability and lattice compressibility of gaspéite (NiCO3) to 50 GPa. Our study is motivated by our interest in understanding high-pressure carbonate behavior. While carbonates have been extensively studied under...
by carscat | Jan 10, 2021 | Science Highlights
Phase egg (AlSiO3OH), an important hydrous phase in the Al2O3–SiO2–H2O ternary system, was found in the superdeep diamond from the mantle transition zone. Here, we have investigated the compressibility and the crystal structural evolution of phase egg using the...
by carscat | Jan 8, 2021 | Science Highlights
Utilizing the synchrotron x-ray powder diffraction As2Se3 has been investigated under high pressure in a diamond anvil cell with hydrogen and neon applied as the pressure media. For both systems the amorphous samples were compressed to ca. 2–3 GPa and heated in situ...