Abstract
High-energy heavy ion irradiation can produce permanent damage in the target material if the density of deposited energy surpasses a material-dependent threshold value. It is known that this threshold can be lowered in the vicinity of the surface or in the presence of defects. In the present study, we established threshold values for Al2O3, MgO and CaF2 under the above-mentioned conditions, and found those values to be much lower than expected. By means of atomic force microscopy and Rutherford backscattering spectrometry in channelling mode, we present evidence that ion beams with values of 3 MeV O and 5 MeV Si, despite the low density of deposited energy along the ion trajectory, can modify the structure of investigated materials. The obtained results should be relevant for radiation hardness studies because, during high-energy ion irradiation, unexpected damage build-up can occur under similar conditions.
Highlights
We have found that ion tracks can be found on surfaces of highly resistant oxides Al2 O3 and MgO already at 8–9 keV/nm, well below the threshold for ion track formation in the bulk, which is considered to be between 15 and 18 keV/nm [19]
We have investigated the response of Al2 O3, MgO and
By means of atomic force microscopy (AFM), ion tracks have been found on the surfaces of Al2 O3 and CaF2 after 5 MeV Si irradiation, and on the surface of MgO
Summary
Citation: Hanžek, J.; Dubček, P.; Fazinić, S.; Tomić Luketić, K.; Karlušić, M. High-Energy Heavy IonIrradiation of Al2 O3 , MgO and CaF2 .Materials 2022, 15, 2110. https://doi.org/10.3390/ma15062110Academic Editor: Amir MostafaeiReceived: 24 February 2022Accepted: 11 March 2022Published: 13 March 2022Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations.Licensee MDPI, Basel, Switzerland.Attribution (CC BY) license (https://
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