Latent ion tracks were finally observed in diamond

H. Amekura (), A. Chettah, K. Narumi, A. Chiba, Y. Hirano, K. Yamada, S. Yamamoto, A. A. Leino, F. Djurabekova, K. Nordlund, N. Ishikawa, N. Okubo and Y. Saitoh
Additional contact information
H. Amekura: National Institute for Materials Science (NIMS)
A. Chettah: University of 20 Août 1955-Skikda
K. Narumi: National Institutes for Quantum Science and Technology (QST)
A. Chiba: National Institutes for Quantum Science and Technology (QST)
Y. Hirano: National Institutes for Quantum Science and Technology (QST)
K. Yamada: National Institutes for Quantum Science and Technology (QST)
S. Yamamoto: National Institutes for Quantum Science and Technology (QST)
A. A. Leino: University of Helsinki
F. Djurabekova: University of Helsinki
K. Nordlund: University of Helsinki
N. Ishikawa: Japan Atomic Energy Agency (JAEA)
N. Okubo: Japan Atomic Energy Agency (JAEA)
Y. Saitoh: National Institutes for Quantum Science and Technology (QST)

Nature Communications, 2024, vol. 15, issue 1, 1-10

Abstract: Abstract Injecting high-energy heavy ions in the electronic stopping regime into solids can create cylindrical damage zones called latent ion 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 2–9 MeV 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.

Date: 2024
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DOI: 10.1038/s41467-024-45934-4

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