Ultrafast X-Ray Diffraction Visualization ofB1−B2Phase Transition in KCl under Shock Compression,Physical Review Letters

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Ultrafast X-Ray Diffraction Visualization ofB1−B2Phase Transition in KCl under Shock Compression
Physical Review Letters ( IF 8.1 ) Pub Date : 2021-07-23 , DOI: 10.1103/physrevlett.127.045702
Y Y Zhang ₁ , Y X Li ₁ , D Fan ₁ , N B Zhang ₁ , J W Huang ₁ , M X Tang ₁ , Y Cai ₁ , X L Zeng ₁ , T Sun ₂ , K Fezzaa ₂ , S Chen ₁ , S N Luo ₃

Affiliation

The classical

B 1 (NaCl) \leftrightarrow B 2 (CsCl)

transitions have been considered as a model for general structural phase transformations, and resolving corresponding phase transition mechanisms under high strain rate shock compression is critical to a fundamental understanding of phase transition dynamics. Here, we use subnanosecond synchrotron x-ray diffraction to visualize the lattice response of single-crystal KCl to planar shock compression. Complete

B 1 − B 2

orientation relations are revealed for KCl under shock compression along

{⟨ 100 ⟩}_{B 1}

and

{⟨ 110 ⟩}_{B 1}

; the orientation relations and transition mechanisms are anisotropic and can be described with the standard and modified Watanabe-Tokonami-Morimoto model, respectively, both involving interlayer sliding and intralayer ion rearrangement. The current study also establishes a paradigm for investigating solid-solid phase transitions under dynamic extremes with ultrafast synchrotron x-ray diffraction.

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