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arXiv · 2303.08857

Phase transition kinetics revealed by in situ X-ray diffraction in laser-heated dynamic diamond anvil cells

Matthew Ricks·Arianna E. Gleason·Francesca Miozzi·Hong Yang·Stella Chariton·Vitali B. Prakapenka·Stanislav V. Sinogeikin·Richard L. Sandberg·Wendy L. Mao·Silvia Pandolfi
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Abstract

We report on a novel approach to dynamic compression of materials that bridges the gap between previous static- and dynamic- compression techniques, allowing to explore a wide range of pathways in the pressure-temperature space. By combining a dynamic-diamond anvil cell setup with double-sided laser-heating and in situ X-ray diffraction, we are able to perform dynamic compression at high temperature and characterize structural transitions with unprecedented time resolution. Using this method, we investigate the $\gamma-\epsilon$ phase transition of iron under dynamic compression for the first time, reaching compression rates of hundreds of GPa/s and temperatures of 2000 K. Our results demonstrate a distinct response of the $\gamma-\epsilon$ and $\alpha-\epsilon$ transitions to the high compression rates achieved. These findings open up new avenues to study tailored dynamic compression pathways in the pressure-temperature space and highlight the potential of this platform to capture kinetic effects in a diamond anvil cell.

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Matthew Ricks, Arianna E. Gleason, Francesca Miozzi, Hong Yang, Stella Chariton, Vitali B. Prakapenka, Stanislav V. Sinogeikin, Richard L. Sandberg, Wendy L. Mao, Silvia Pandolfi. 2023-03-15. Phase transition kinetics revealed by in situ X-ray diffraction in laser-heated dynamic diamond anvil cells. https://arxiv.org/abs/2303.08857

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