by O. Peña-Rodríguez, J. Manzano-Santamaría, A. Rivera, G. García, J. Olivares and F. Agulló-López
Abstract:
The kinetics of amorphization in crystalline SiO2 (α-quartz) under irradiation with swift heavy ions (O+1 at 4MeV, O+4 at 13MeV, F+2 at 5MeV, F+4 at 15MeV, Cl+3 at 10MeV, Cl+4 at 20MeV, Br+5 at 15 and 25MeV and Br+8 at 40MeV) has been analyzed in this work with an Avrami-type law and also with a recently developed cumulative approach (track-overlap model). This latter model assumes a track morphology consisting of an amorphous core (area σ) and a surrounding defective halo (area h), both being axially symmetric. The parameters of the two approaches which provide the best fit to the experimental data have been obtained as a function of the electronic stopping power Se. The extrapolation of the σ(Se) dependence yields a threshold value for amorphization, Sth≈2.1keV/nm; a second threshold is also observed around 4.1keV/nm. We believe that this double-threshold effect could be related to the appearance of discontinuous tracks in the region between 2.1 and 4.1keV/nm. For stopping power values around or below the lower threshold, where the ratio h/σ is large, the track-overlap model provides a much better fit than the Avrami function. Therefore, the data show that a right modeling of the amorphization kinetics needs to take into account the contribution of the defective track halo. Finally, a short comparative discussion with the kinetic laws obtained for elastic collision damage is given.
Reference:
O. Peña-Rodríguez, J. Manzano-Santamaría, A. Rivera, G. García, J. Olivares and F. Agulló-López, “Kinetics of amorphization induced by swift heavy ions in α-quartz”, Journal of Nuclear Materials, vol. 430, no. 1, pp. 125–131.
Bibtex Entry:
@article{pena-rodriguez_kinetics_2012,
title = {Kinetics of amorphization induced by swift heavy ions in α-quartz},
volume = {430},
issn = {0022-3115},
url = {http://www.sciencedirect.com/science/article/pii/S0022311512003601},
doi = {10.1016/j.jnucmat.2012.07.001},
abstract = {The kinetics of amorphization in crystalline SiO2 (α-quartz) under irradiation with swift heavy ions (O+1 at 4MeV, O+4 at 13MeV, F+2 at 5MeV, F+4 at 15MeV, Cl+3 at 10MeV, Cl+4 at 20MeV, Br+5 at 15 and 25MeV and Br+8 at 40MeV) has been analyzed in this work with an Avrami-type law and also with a recently developed cumulative approach (track-overlap model). This latter model assumes a track morphology consisting of an amorphous core (area σ) and a surrounding defective halo (area h), both being axially symmetric. The parameters of the two approaches which provide the best fit to the experimental data have been obtained as a function of the electronic stopping power Se. The extrapolation of the σ(Se) dependence yields a threshold value for amorphization, Sth≈2.1keV/nm; a second threshold is also observed around 4.1keV/nm. We believe that this double-threshold effect could be related to the appearance of discontinuous tracks in the region between 2.1 and 4.1keV/nm. For stopping power values around or below the lower threshold, where the ratio h/σ is large, the track-overlap model provides a much better fit than the Avrami function. Therefore, the data show that a right modeling of the amorphization kinetics needs to take into account the contribution of the defective track halo. Finally, a short comparative discussion with the kinetic laws obtained for elastic collision damage is given.},
number = {1},
urldate = {2017-10-10},
journal = {Journal of Nuclear Materials},
author = {Peña-Rodríguez, O. and Manzano-Santamaría, J. and Rivera, A. and García, G. and Olivares, J. and Agulló-López, F.},
month = nov,
year = {2012},
pages = {125--131},
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}