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

Peter Vester, Morten Christensen, Elisa Biasin, Simon O. Mariager, Gemma Newby, Dmitry Khakhulin, Federico Zontone, Michael Wulff, Robert Krarup Feidenhans'l, Martin M. Nielsen, Kristoffer Haldrup*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

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.
Original languageEnglish
Article number245425
JournalPhysical Review B
Volume100
Issue number24
Number of pages8
ISSN1098-0121
DOIs
Publication statusPublished - 2019

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