Identification of Phase Transitions and Metastability in Dynamically Compressed Antimony Using Ultrafast X-Ray Diffraction
- The Univ. of Edinburgh, Edinburgh (United Kingdom); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- The Univ. of Edinburgh, Edinburgh (United Kingdom)
- Univ. of Oxford, Oxford (United Kingdom)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Stanford Univ., Stanford, CA (United States)
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- 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
Web of Science
Commensurate-incommensurate phase transition of dense potassium simulated by machine-learned interatomic potential
|
journal | December 2019 |
Similar Records
Femtosecond diffraction studies of solid and liquid phase changes in shock-compressed bismuth
Recovery of metastable dense Bi synthesized by shock compression