Memorias de investigación
Research Publications in journals:
Kinetics of amorphization induced by swift heavy ions in a-quartz
Year:2012
Research Areas
  • Engineering
Information
Abstract
The kinetics of amorphization in crystalline SiO2 (a-quartz) under irradiation with swift heavy ions (O+1 at 4 MeV, O+4 at 13 MeV, F+2 at 5 MeV, F+4 at 15 MeV, Cl+3 at 10 MeV, Cl+4 at 20 MeV, Br+5 at 15 and 25 MeV and Br+8 at 40 MeV) 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 r) 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 r(Se) dependence yields a threshold value for amorphization, Sth ? 2.1 keV/nm; a second threshold is also observed around 4.1 keV/nm. We believe that this double-threshold effect could be related to the appearance of discontinuous tracks in the region between 2.1 and 4.1 keV/nm. For stopping power values around or below the lower threshold, where the ratio h/r 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
International
Si
JCR
Si
Title
Journal of Nuclear Materials
ISBN
0022-3115
Impact factor JCR
Impact info
Volume
430
Journal number
From page
125
To page
131
Month
SIN MES
Ranking
Participants
  • Autor: Ovidio Yordanis Peña Rodriguez UPM
  • Autor: J. Manzano-Santamaría EURATOM CIEMAT
  • Autor: Antonio Juan Rivera de Mena UPM
  • Autor: G. García Laboratory of Synchrotron Light
  • Autor: J. Olivares CSIC
  • Autor: F. Agulló-López Centro de Micro-Análisis de Materiales
Research Group, Departaments and Institutes related
  • Creador: Grupo de Investigación: Fusión Nuclear Inercial y Tecnología de fusión
  • Departamento: Ingeniería Nuclear
  • Centro o Instituto I+D+i: Instituto de Fusión Nuclear