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Title: X-ray tracking of structural changes during a subnanosecond solid-solid phase transition in cobalt nanoparticles

Journal Article · · Physical Review B
ORCiD logo [1]; ORCiD logo [1];  [2];  [3]; ORCiD logo [4];  [5];  [4];  [4];  [6]; ORCiD logo [1]; ORCiD logo [1]
  1. Technical Univ. of Denmark, Lyngby (Denmark)
  2. Technical Univ. of Denmark, Lyngby (Denmark); SLAC National Accelerator Lab., Menlo Park, CA (United States). Photon Ultrafast Laser Science and Engineering Inst. (PULSE)
  3. Univ. of Copenhagen (Denmark). The Niels Bohr Inst.
  4. European Synchrotron Radiation Facility (ESRF), Grenoble (France)
  5. European Synchrotron Radiation Facility (ESRF), Grenoble (France); European X-ray Free-Electron Laser (XFEL), Hamburg (Germany)
  6. 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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