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

Article

关键词: NANOCRYSTALS;    TIME;    REDUCTION;    DYNAMICS;    GRAPHENE;    PROBE;    PUMP;   

DOI  :  10.1103/PhysRevB.100.245425

来源: SCIE

【 摘 要 】

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 epsilon 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.

【 授权许可】

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