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Direct Observations of a Dynamically Driven Phase Transition with in situ X-Ray Diffraction in a Simple Ionic Crystal

Journal Article · · Physical Review Letters
 [1];  [1];  [1];  [2];  [2];  [3];  [3];  [4];  [4]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  2. Washington State Univ., Argonne, IL (United States)
  3. Univ. of Nevada, Las Vegas, NV (United States)
  4. Carnegie Institute of Washington, Argonne, IL (United States)

Here, we report real-time observations of a phase transition in the ionic solid CaF2, a model AB2 structure in high-pressure physics. Synchrotron x-ray diffraction coupled with dynamic loading to 27.7 GPa, and separately with static compression, follows, in situ, the fluorite to cotunnite structural phase transition, both on nanosecond and on minute time scales. Using Rietveld refinement techniques, we examine the kinetics and hysteresis of the transition. Our results give insight into the kinetic time scale of the fluorite-cotunnite phase transition under shock compression, which is relevant to a number of isomorphic compounds.

Research Organization:
Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC04-94AL85000
OSTI ID:
1421646
Alternate ID(s):
OSTI ID: 1513722
OSTI ID: 1414515
OSTI ID: 1416576
Report Number(s):
SAND--2018-0578J; 660051
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 25 Vol. 119; ISSN 0031-9007; ISSN PRLTAO
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (4)

Polycapillary x-ray lenses for single-shot, laser-driven powder diffraction journal October 2018
Direct observation of the hcp-bcc phase transition and melting along the principal Hugoniot of Mg journal January 2020
Nanosecond Melting and Recrystallization in Shock-Compressed Silicon journal September 2018
Structural Transformation and Melting in Gold Shock Compressed to 355 GPa journal July 2019

Figures / Tables (5)


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