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Title: Use of the point defect model to interpret the iron oxidation kinetics under proton irradiation

Abstract

This article concerns the study of iron corrosion in wet air under mega-electron-volt proton irradiation for different fluxes at room temperature and with a relative humidity fixed to 45%. Oxidized iron sample surfaces are characterized by ion beam analysis (Rutherford backscattering spectrometry and elastic recoil detection analysis), for the elemental analysis. The structural and physicochemical characterization is performed using the x-ray photoelectron spectroscopy and transmission electron microscopy techniques. We have also measured the iron oxidation kinetics. Radiation enhanced diffusion and transport processes have been evidenced. The modeling of the experimental data shows that the apparent oxygen diffusion coefficient increases whereas the oxygen transport velocity decreases as function of flux. Finally, the point defect model has been used to determine the electric field value in the samples. Results have shown that the transport process can be attributed to the presence of an electrical potential gradient.

Authors:
; ; ; ; ; ;  [1];  [2];  [3];  [4]
  1. Universite Claude Bernard Lyon I, Institut de Physique Nucleaire de Lyon, Institut National de Physique Nucleaire et de Physique des Particules, Centre National de Recherche Scientifique, 4 rue Enrico Fermi, 69622 Villeurbanne Cedex (France)
  2. (France)
  3. (GEMPPM), Institut National des Sciences Appliquees de Lyon (INSA), 20 Av. A. Einstein, 69621 Villeurbanne (France)
  4. (ANDRA), Parc de la Croix Blanche 1-7 rue Jean Monnet, F-92298 Chatenay-Malabry Cedex (France)
Publication Date:
OSTI Identifier:
20982780
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 101; Journal Issue: 6; Other Information: DOI: 10.1063/1.2711759; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; AIR; CORROSION; ELECTRIC FIELDS; HUMIDITY; ION BEAMS; IRON; IRRADIATION; OXIDATION; OXYGEN; POINT DEFECTS; POTENTIALS; PROTONS; REACTION KINETICS; RECOILS; RUTHERFORD BACKSCATTERING SPECTROSCOPY; SIMULATION; TEMPERATURE RANGE 0273-0400 K; TRANSMISSION ELECTRON MICROSCOPY; X-RAY PHOTOELECTRON SPECTROSCOPY

Citation Formats

Lapuerta, S., Moncoffre, N., Jaffrezic, H., Millard-Pinard, N., Bererd, N., Esnouf, C., Crusset, D., UCBL, Institut Universitaire Technologique A and IPNL, IN2P3/CNRS, 94, boulevard du Niels Bohr, 69622 Villeurbanne Cedex, Groupe d'Etudes de Metallurgie Physique et de Physique des Materiaux, and Agence Nationale pour la gestion de Dechets Radioactifs. Use of the point defect model to interpret the iron oxidation kinetics under proton irradiation. United States: N. p., 2007. Web. doi:10.1063/1.2711759.
Lapuerta, S., Moncoffre, N., Jaffrezic, H., Millard-Pinard, N., Bererd, N., Esnouf, C., Crusset, D., UCBL, Institut Universitaire Technologique A and IPNL, IN2P3/CNRS, 94, boulevard du Niels Bohr, 69622 Villeurbanne Cedex, Groupe d'Etudes de Metallurgie Physique et de Physique des Materiaux, & Agence Nationale pour la gestion de Dechets Radioactifs. Use of the point defect model to interpret the iron oxidation kinetics under proton irradiation. United States. doi:10.1063/1.2711759.
Lapuerta, S., Moncoffre, N., Jaffrezic, H., Millard-Pinard, N., Bererd, N., Esnouf, C., Crusset, D., UCBL, Institut Universitaire Technologique A and IPNL, IN2P3/CNRS, 94, boulevard du Niels Bohr, 69622 Villeurbanne Cedex, Groupe d'Etudes de Metallurgie Physique et de Physique des Materiaux, and Agence Nationale pour la gestion de Dechets Radioactifs. Thu . "Use of the point defect model to interpret the iron oxidation kinetics under proton irradiation". United States. doi:10.1063/1.2711759.
@article{osti_20982780,
title = {Use of the point defect model to interpret the iron oxidation kinetics under proton irradiation},
author = {Lapuerta, S. and Moncoffre, N. and Jaffrezic, H. and Millard-Pinard, N. and Bererd, N. and Esnouf, C. and Crusset, D. and UCBL, Institut Universitaire Technologique A and IPNL, IN2P3/CNRS, 94, boulevard du Niels Bohr, 69622 Villeurbanne Cedex and Groupe d'Etudes de Metallurgie Physique et de Physique des Materiaux and Agence Nationale pour la gestion de Dechets Radioactifs},
abstractNote = {This article concerns the study of iron corrosion in wet air under mega-electron-volt proton irradiation for different fluxes at room temperature and with a relative humidity fixed to 45%. Oxidized iron sample surfaces are characterized by ion beam analysis (Rutherford backscattering spectrometry and elastic recoil detection analysis), for the elemental analysis. The structural and physicochemical characterization is performed using the x-ray photoelectron spectroscopy and transmission electron microscopy techniques. We have also measured the iron oxidation kinetics. Radiation enhanced diffusion and transport processes have been evidenced. The modeling of the experimental data shows that the apparent oxygen diffusion coefficient increases whereas the oxygen transport velocity decreases as function of flux. Finally, the point defect model has been used to determine the electric field value in the samples. Results have shown that the transport process can be attributed to the presence of an electrical potential gradient.},
doi = {10.1063/1.2711759},
journal = {Journal of Applied Physics},
number = 6,
volume = 101,
place = {United States},
year = {Thu Mar 15 00:00:00 EDT 2007},
month = {Thu Mar 15 00:00:00 EDT 2007}
}
  • The kinetics of defect accumulation under electron irradiation have been studied in pure KBr in the temperature range where no defect is thermally mobile. Kinetics are given for F, F/sup +/, H, I, and V/sub k/ centers which constitute the main part of the centers created at 4 K in pure crystals. The concentrations lie up to a few 10/sup 19/ cm/sup -3/ and are measured by optical absorption. In the lower concentration range, the kinetics shapes are well explained by considering a local action of the stabilized interstitial centers on the newly created Frenkel pairs, causing their quick recombination.more » At concentrations higher than 10/sup 19/ cm/sup -3/, the decrease of the F-center creation yield is explained by the possibility of uncorrelated recombinations of the F centers and the H centers moving as dynamical crowdions, because their range becomes larger than the average separation between two centers in the crystal. The initial inhibition process for the creation of new defects is temptatively assigned to the deformation of the lattice in the vicinity of stabilized I centers, causing the impossibility of a sufficient separation of a new Frenkel pair.« less
  • Crystal defects generated during irradiation can result in severe changes in morphology and an overall degradation of mechanical properties in a given material. Nanomaterials have been proposed as radiation damage tolerant materials, due to the hypothesis that defect density decreases with grain size refinement due to the increase in grain boundary surface area. The lower defect density should arise from grain boundary-point defect absorption and enhancement of interstitial-vacancy annihilation. In this study, low energy helium ion irradiation on free-standing iron thin films were performed at 573 K. Interstitial loops of a 0 /2 [111] Burgers vector were directly observed asmore » a result of the displacement damage. Loop density trends with grain size demonstrated an increase in the nanocrystalline (<100 nm) regime, but scattered behavior in the transition from the nanocrystalline to the ultra-fine regime (100–500 nm). To examine the validity of such trends, loop density and area for different grains at various irradiation doses were compared and revealed efficient defect absorption in the nanocrystalline grain size regime, but loop coalescence in the ultra-fine grain size regime. Lastly, a relationship between the denuded zone formation, a measure of grain boundary absorption efficiency, grain size, grain boundary type and misorientation angle is determined.« less