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Description:

Injecting high-energy heavy ions in the electronic stopping regime into solids can create cylindrical damage zones calledlatention tracks. Although these tracks form in many materials, none have ever been observed in diamond, even when irradiated with high-energy GeV uranium ions. Here we report the first observation of ion track formation in diamond irradiated with 2–9MeV C60 fullerene ions. Depending on the ion energy, the mean track length (diameter) changed from 17 (3.2) nm to 52 (7.1) nm. High resolution scanning transmission electron microscopy (HR-STEM) indicated the amorphization in the tracks, in which π-bonding signal from graphite was detected by the electron energy loss spectroscopy (EELS). Since the melting transition is not induced in diamond at atmospheric pressure, conventional inelastic thermal spike calculations cannot be applied. Two-temperature molecular dynamics simulations succeeded in the reproduction of both the track formation under MeV C60 irradiations and the no-track formation under GeV monoatomic ion irradiations.

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: ion track, diamond, C60 ion, transmission electron microscopy, velocity effect

Date published: 2024-02-27

Publisher: Springer Science and Business Media LLC

Journal:

• Nature Communications (ISSN: 20411723) vol. 15 issue. 1 1786

Funding:

• JSPS 22K04990 (科研費基盤C 「疑似核分裂片としてのMeV-C60の核・電子相乗効果によるトラック型欠陥形成」)

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1038/s41467-024-45934-4

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Updated at: 2024-03-04 16:30:07 +0900

Published on MDR: 2024-03-04 16:30:08 +0900