Ultrafast X-Ray Diffraction Visualization of B1-B2 Phase Transition in KCl under Shock Compression

Y. Y. Zhang, Y. X. Li, D. Fan, N. B. Zhang, J. W. Huang, M. X. Tang, Y. Cai, X. L. Zeng, T. Sun, K. Fezzaa, S. Chen, S. N. Luo

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12 Scopus citations


The classical B1(NaCl)↔B2(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 B1-B2 orientation relations are revealed for KCl under shock compression along «100»B1 and «110»B1; 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.

Original languageEnglish (US)
Article number045702
JournalPhysical review letters
Issue number4
StatePublished - Jul 23 2021

ASJC Scopus subject areas

  • General Physics and Astronomy


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