X-ray tracking of structural changes during a subnanosecond solid-solid phase transition in cobalt nanoparticles
Journal Article
·
· Physical Review B
- Technical Univ. of Denmark, Lyngby (Denmark)
- Technical Univ. of Denmark, Lyngby (Denmark); SLAC National Accelerator Lab., Menlo Park, CA (United States). Photon Ultrafast Laser Science and Engineering Inst. (PULSE)
- Univ. of Copenhagen (Denmark). The Niels Bohr Inst.
- European Synchrotron Radiation Facility (ESRF), Grenoble (France)
- European Synchrotron Radiation Facility (ESRF), Grenoble (France); European X-ray Free-Electron Laser (XFEL), Hamburg (Germany)
- European X-ray Free-Electron Laser (XFEL), Hamburg (Germany); Univ. of Copenhagen (Denmark). The Niels Bohr Inst.
This work presents measurements of laser-induced solid-solid phase transitions in Co nanoparticles, using time-resolved wide-angle x-ray scattering with <100-ps time resolution. A comparison of the experimental results with scattering simulations indicates a phase transition from the as-synthesized ε phase into a mixed phase of 2/3 hcp and 1/3 fcc character during the first 100 ps. The measured scattering signal observed at the shortest investigated time delay of 20 ps has less scattering intensity at the dominant fcc/hcp Bragg peak positions compared to the difference signal acquired at 100 ps. This suggests the formation of a partially disordered solid intermediate phase on the sub-100-ps timescale.
- Research Organization:
- SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- AC02-76SF00515
- OSTI ID:
- 1605027
- Journal Information:
- Physical Review B, Journal Name: Physical Review B Journal Issue: 24 Vol. 100; ISSN 2469-9950; ISSN PRBMDO
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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