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Title: 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 Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC04-94AL85000; NA-0003525; NA0002442; NA0001974; FG02-99ER45775; AC02-06CH11357; NA0001982
OSTI ID:
1421646
Alternate ID(s):
OSTI ID: 1414515
Report Number(s):
SAND-2018-0578J; PRLTAO; 660051; TRN: US1801540
Journal Information:
Physical Review Letters, Vol. 119, Issue 25; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 16 works
Citation information provided by
Web of Science

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Cited By (2)

Polycapillary x-ray lenses for single-shot, laser-driven powder diffraction journal October 2018
Nanosecond Melting and Recrystallization in Shock-Compressed Silicon journal September 2018

Figures / Tables (5)


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