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Quantitating Iron Transport Across the Mouse Placenta In Vivo Using Nonradioactive Iron Isotopes
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Self-trapped interstitial-type defects in iron.

D A Terentyev1, T P C Klaver, P Olsson

  • 1Nuclear Materials Science Institute, SCK-CEN, Boeretang 200, B-2400, Mol, Belgium.

Physical Review Letters
|June 4, 2008
PubMed
Summary
This summary is machine-generated.

New iron defects with complex structures exhibit low mobility, explaining experimental observations of microstructure evolution under irradiation. These findings differ from previous simulations of conventional self-interstitial clusters.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Computational Materials Science

Background:

  • Understanding defect behavior in materials is crucial for predicting their performance under irradiation.
  • Previous atomistic simulations suggested fast migration of self-interstitial clusters in iron, conflicting with experimental data.
  • The microstructure evolution of iron under irradiation requires a more comprehensive understanding of defect dynamics.

Purpose of the Study:

  • To investigate the nature and mobility of small interstitial-type defects in iron.
  • To reconcile discrepancies between atomistic simulations and experimental observations of microstructure evolution.
  • To identify novel defect structures that explain the low mobility of clusters.

Main Methods:

  • Molecular dynamics (MD) simulations were employed to reveal small interstitial-type defects in iron.
  • Density functional theory (DFT) calculations were used to confirm the stability of identified defect clusters.
  • Analysis of vibrational formation entropies was performed to understand defect stability with temperature.

Main Results:

  • MD simulations identified a new family of small interstitial-type defects in iron with complex structures.
  • These complex defects exhibit very low mobilities compared to conventional self-interstitial clusters.
  • DFT calculations confirmed the stability of these defect clusters, which increases with temperature due to large vibrational formation entropies.
  • The findings provide a theoretical explanation for experimentally observed low cluster mobilities.

Conclusions:

  • A new class of stable, low-mobility interstitial defects in iron has been identified.
  • These complex defects offer a resolution to the long-standing discrepancy between simulated and experimental defect mobilities in irradiated iron.
  • The results necessitate a revision of models for microstructure evolution in iron under irradiation, considering these complex defect structures.