Kinetics of amorphization induced by swift heavy ions in α-quartz

Peña Rodríguez, Ovidio Y.; Manzano Santamaría, Javier; Rivera de Mena, Antonio; García, Gastón; Olivares Villegas, José y Agullo Lopez, Fernando (2012). Kinetics of amorphization induced by swift heavy ions in α-quartz. "Journal of Nuclear Materials", v. 430 (n. 1-3); pp. 125-131. ISSN 0022-3115. https://doi.org/10.1016/j.jnucmat.2012.07.001.

Descripción

Título: Kinetics of amorphization induced by swift heavy ions in α-quartz
Autor/es:
  • Peña Rodríguez, Ovidio Y.
  • Manzano Santamaría, Javier
  • Rivera de Mena, Antonio
  • García, Gastón
  • Olivares Villegas, José
  • Agullo Lopez, Fernando
Tipo de Documento: Artículo
Título de Revista/Publicación: Journal of Nuclear Materials
Fecha: Noviembre 2012
Volumen: 430
Materias:
Escuela: E.T.S.I. Industriales (UPM)
Departamento: Ingeniería Nuclear [hasta 2014]
Licencias Creative Commons: Reconocimiento - Sin obra derivada - No comercial

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Resumen

The kinetics of amorphization in crystalline SiO2 (α-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 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 ≈ 2.1 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/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.

Más información

ID de Registro: 15613
Identificador DC: http://oa.upm.es/15613/
Identificador OAI: oai:oa.upm.es:15613
Identificador DOI: 10.1016/j.jnucmat.2012.07.001
URL Oficial: http://www.sciencedirect.com/science/article/pii/S0022311512003601
Depositado por: Memoria Investigacion
Depositado el: 08 Dic 2013 14:16
Ultima Modificación: 30 May 2017 16:03
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