by M. L. Crespillo, F. Agulló-López and A. Zucchiatti
Abstract:
An extensive survey for the formation energies of Frenkel pairs, as representative candidates for radiation-induced point defects, is presented and discussed in relation to the cumulative mechanisms (CM) of track formation in dielectric materials under swift heavy ion (SHI) irradiation. These mechanisms rely on the generation and accumulation of point defects during irradiation followed by collapse of the lattice once a threshold defect concentration is reached. The physical basis of those approaches has been discussed by Fecht as a defect-assisted transition to an amorphous phase. Although a first quantitative analysis of the CM model was previously performed for LiNbO3 crystals, we have, here, adopted a broader phenomenological approach. It explores the correlation between track formation thresholds and the energies for Frenkel pair formation for a broad range of materials. It is concluded that the threshold stopping powers can be roughly scaled with the energies required to generate a critical Frenkel pair concentration in the order of a few percent of the total atomic content. Finally, a comparison with the predictions of the thermal spike model is discussed within the analytical Szenes approximation.
Reference:
M. L. Crespillo, F. Agulló-López and A. Zucchiatti, “Cumulative approaches to track formation under swift heavy ion (SHI) irradiation: Phenomenological correlation with formation energies of Frenkel pairs”, Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, vol. 394, pp. 20–27.
Bibtex Entry:
@article{crespillo_cumulative_2017,
title = {Cumulative approaches to track formation under swift heavy ion ({SHI}) irradiation: {Phenomenological} correlation with formation energies of {Frenkel} pairs},
volume = {394},
issn = {0168-583X},
shorttitle = {Cumulative approaches to track formation under swift heavy ion ({SHI}) irradiation},
url = {http://www.sciencedirect.com/science/article/pii/S0168583X16305572},
doi = {10.1016/j.nimb.2016.12.022},
abstract = {An extensive survey for the formation energies of Frenkel pairs, as representative candidates for radiation-induced point defects, is presented and discussed in relation to the cumulative mechanisms (CM) of track formation in dielectric materials under swift heavy ion (SHI) irradiation. These mechanisms rely on the generation and accumulation of point defects during irradiation followed by collapse of the lattice once a threshold defect concentration is reached. The physical basis of those approaches has been discussed by Fecht as a defect-assisted transition to an amorphous phase. Although a first quantitative analysis of the CM model was previously performed for LiNbO3 crystals, we have, here, adopted a broader phenomenological approach. It explores the correlation between track formation thresholds and the energies for Frenkel pair formation for a broad range of materials. It is concluded that the threshold stopping powers can be roughly scaled with the energies required to generate a critical Frenkel pair concentration in the order of a few percent of the total atomic content. Finally, a comparison with the predictions of the thermal spike model is discussed within the analytical Szenes approximation.},
urldate = {2017-08-01},
journal = {Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms},
author = {Crespillo, M. L. and Agulló-López, F. and Zucchiatti, A.},
month = mar,
year = {2017},
keywords = {Swift heavy ion irradiation, Cumulative defect models, Electronic stopping power threshold, Frenkel pair formation energies, Ion track formation, Ion-solid interaction, Order to disorder microstructure phase transformation, Radiation-induced damage mechanisms, Radiation-induced point defects, Thermal spike model},
pages = {20--27},
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}