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Title: Oxygen diffusion and oxide phase formation in iron under swift heavy ion irradiation

Abstract

While irradiating thin iron films deposited on silicon wafers with swift heavy ions in the energy range of a few MeV/amu, we have observed that the iron surface oxidizes due to the residual oxygen in the irradiation chamber, induced by the energy deposition by the ion. We have investigated these processes in detail using Rutherford backscattering spectrometry and conversion electron Moessbauer spectroscopy. We found that two different types of oxidation processes were active, depending on the electronic energy loss of the incident ions. Irradiations above the track formation threshold S{sub ec}{sup Fe} of iron resulted in diffusion-controlled dissolution of oxygen in the iron bulk. Below S{sub ec}{sup Fe}, but above the track formation threshold of iron oxide, chemical reaction and homogeneous oxide phase formation took place in a surface layer, while almost no oxygen diffusion into the iron bulk could be observed anymore. These phenomena are discussed in terms of the oxygen mobility in the excited ion tracks in iron and iron oxide. The effective diffusion constant estimated for swift heavy ion induced oxygen diffusion in iron is larger by a factor of 100-1000 than the one reported for thermally activated oxygen diffusion in molten iron.

Authors:
;  [1]
  1. Institut fuer Strahlenphysik, Universitaet Stuttgart, Allmandring 3, 70569 Stuttgart (Germany)
Publication Date:
OSTI Identifier:
20976671
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. B, Condensed Matter and Materials Physics; Journal Volume: 75; Journal Issue: 5; Other Information: DOI: 10.1103/PhysRevB.75.054107; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; DIFFUSION; ELECTRONS; ENERGY LOSSES; HEAVY IONS; ION BEAMS; ION MOBILITY; IRON; IRON OXIDES; IRRADIATION; LAYERS; MEV RANGE; MOESSBAUER EFFECT; OXIDATION; OXYGEN; PARTICLE TRACKS; RUTHERFORD BACKSCATTERING SPECTROSCOPY; SILICON; SURFACES; THIN FILMS

Citation Formats

Roller, Tobias, and Bolse, Wolfgang. Oxygen diffusion and oxide phase formation in iron under swift heavy ion irradiation. United States: N. p., 2007. Web. doi:10.1103/PHYSREVB.75.054107.
Roller, Tobias, & Bolse, Wolfgang. Oxygen diffusion and oxide phase formation in iron under swift heavy ion irradiation. United States. doi:10.1103/PHYSREVB.75.054107.
Roller, Tobias, and Bolse, Wolfgang. Thu . "Oxygen diffusion and oxide phase formation in iron under swift heavy ion irradiation". United States. doi:10.1103/PHYSREVB.75.054107.
@article{osti_20976671,
title = {Oxygen diffusion and oxide phase formation in iron under swift heavy ion irradiation},
author = {Roller, Tobias and Bolse, Wolfgang},
abstractNote = {While irradiating thin iron films deposited on silicon wafers with swift heavy ions in the energy range of a few MeV/amu, we have observed that the iron surface oxidizes due to the residual oxygen in the irradiation chamber, induced by the energy deposition by the ion. We have investigated these processes in detail using Rutherford backscattering spectrometry and conversion electron Moessbauer spectroscopy. We found that two different types of oxidation processes were active, depending on the electronic energy loss of the incident ions. Irradiations above the track formation threshold S{sub ec}{sup Fe} of iron resulted in diffusion-controlled dissolution of oxygen in the iron bulk. Below S{sub ec}{sup Fe}, but above the track formation threshold of iron oxide, chemical reaction and homogeneous oxide phase formation took place in a surface layer, while almost no oxygen diffusion into the iron bulk could be observed anymore. These phenomena are discussed in terms of the oxygen mobility in the excited ion tracks in iron and iron oxide. The effective diffusion constant estimated for swift heavy ion induced oxygen diffusion in iron is larger by a factor of 100-1000 than the one reported for thermally activated oxygen diffusion in molten iron.},
doi = {10.1103/PHYSREVB.75.054107},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
number = 5,
volume = 75,
place = {United States},
year = {Thu Feb 01 00:00:00 EST 2007},
month = {Thu Feb 01 00:00:00 EST 2007}
}