High-Pressure Structural Study of α-Mn: Experiments and Calculations

by carscat | Jan 7, 2021 | Science Highlights

Manganese, in the α-Mn structure, has been studied using synchrotron powder x-ray diffraction in a diamond anvil cell up to 220 GPa at room temperature combined with density functional calculations. The experiment reveals an extended pressure stability of the α-Mn...

Unraveling Microstrain-Promoted Structural Evolution and Thermally Driven Phase Transition in c−Sc2O3 Nanocrystals at High Pressure

by carscat | Dec 31, 2020 | Science Highlights

Here, we report an irreversible cubic-to-monoclinic structural transition in cubic c−Sc2O3 nanocrystals which occur at pressures above ∼8.9GPa upon nonhydrostatic compression in association with a pronounced volume collapse. This phase-transition–induced anomaly is...

In Situ Electrical Resistivity and Viscosity Measurements of Iron Alloys Under Pressure Using Synchrotron X-Ray Radiography

by carscat | Dec 28, 2020 | Science Highlights

We have developed a new type of experimental setup utilizing a multi-anvil large volume press and designed for simultaneous measurements of structure-sensitive thermophysical properties (diffraction, electrical resistivity, viscosity). This multi-probe capability was...

Toward Real-Time Analysis of Synchrotron Micro-Tomography Data: Accelerating Experimental Workflows with AI and HPC

by carscat | Dec 18, 2020 | Science Highlights

Synchrotron light sources are routinely used to perform imaging experiments. In this paper, we review the relevant computational stages, identify bottlenecks, and highlight future opportunities to streamline data acquisition for experimental microscopy workflows. We...

Valence Determinations and Oxybarometry on FIB‐Sectioned Olivine and Pyroxene Using Correlated Ti, V, and Cr Micro‐XAFS Spectroscopy: Evaluation of Ion‐Milling Effects and Application to Antarctic Micrometeorite Grains

by carscat | Dec 15, 2020 | Science Highlights

X‐ray absorption fine structure (XAFS) spectroscopy methods have been applied to focused ion beam (FIB) produced sections of olivine and pyroxene for determining the valence states of Ti, V, and Cr and inferring oxygen fugacities of formation for each element....

Constraining the Density Evolution During Destruction of the Lithospheric Mantle in the Eastern North China Craton

by carscat | Dec 11, 2020 | Science Highlights

The thermoelastic properties of minerals in mantle xenoliths combined with the thermal states can provide an integrated understanding of the petrophysics of the lithospheric mantle. Here, we conducted high-pressure and high-temperature experiments on the main minerals...