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Title: Identification of Phase Transitions and Metastability in Dynamically Compressed Antimony Using Ultrafast X-Ray Diffraction

Journal Article · · Physical Review Letters
 [1];  [1];  [1];  [2];  [3];  [4];  [5];  [6];  [6];  [7];  [7];  [7];  [7];  [8];  [6];  [3];  [2]
  1. The Univ. of Edinburgh, Edinburgh (United Kingdom); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. The Univ. of Edinburgh, Edinburgh (United Kingdom)
  3. Univ. of Oxford, Oxford (United Kingdom)
  4. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  5. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Stanford Univ., Stanford, CA (United States)
  6. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  7. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  8. Univ. of Rochester, Rochester, NY (United States)

Ultrafast x-ray diffraction at the LCLS x-ray free electron laser has been used to resolve the structural behavior of antimony under shock compression to 59 GPa. Antimony is seen to transform to the incommensurate, host-guest phase Sb-II at ~11 GPa, which forms on nanosecond timescales with ordered guest-atom chains. The high-pressure bcc phase Sb-III is observed above ~15 GPa, some 8 GPa lower than in static compression studies, and mixed Sb-III/liquid diffraction are obtained between 38 and 59 GPa. An additional phase which does not exist under static compression, Sb–I', is also observed between 8 and 12 GPa, beyond the normal stability field of Sb-I, and resembles Sb-I with a resolved Peierls distortion. In conclusion, the incommensurate Sb-II high-pressure phase can be recovered metastably on release to ambient pressure, where it is stable for more than 10 ns.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
EP/J017256/1; EP/P024513/1; EP/J017051/1; AC52-07NA27344; AC52-06NA25396; AC02-76SF00515; SF00515
OSTI ID:
1546726
Alternate ID(s):
OSTI ID: 1546370; OSTI ID: 1559910
Report Number(s):
LLNL-JRNL-775321; PRLTAO
Journal Information:
Physical Review Letters, Vol. 122, Issue 25; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 30 works
Citation information provided by
Web of Science

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Cited By (1)

Commensurate-incommensurate phase transition of dense potassium simulated by machine-learned interatomic potential journal December 2019

Figures / Tables (4)