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Title: Ion irradiation induced changes in defects of iron thin films: electron microscopy and positron annihilation spectroscopy

Abstract

Single crystal Fe thin films (~250 nm) were grown on MgO substrates and irradiated with 2.0 MeV Fe+ ions at 10 and 50 dpa, and the defect evolution was studied using high resolution Transmission Electron Microscopy (HR-TEM) and Doppler Broadening Positron Annihilation Spectroscopy (PAS). It was shown that irradiation induced or exacerbated a thin oxide layer at the outer interface and produced substantial Fe/Mg mixing at the film/substrate interface, particularly for the higher dose. Modeling of the PAS data allowed interpretation of the defect types at different distances from the Fe surface, and included several types of MgO substrate damage and annihilation condition changes, indicative of damage due to ballistic effects of the Fe atoms as well as chemical changes due to implantation and subsequent diffusion. This detailed PAS study compared with TEM and energy dispersive spectroscopy (EDS) provides significant insight into depth dependent defect creation. These results will be useful for predicting defect creation in Fe-based materials under irradiation conditions, for extension to neutron irradiated structural materials.

Authors:
 [1];  [1];  [1]; ORCiD logo [2];  [2];  [2];  [3]
  1. WASHINGTON STATE UNIV
  2. BATTELLE (PACIFIC NW LAB)
  3. Washington State University
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1572671
Report Number(s):
PNNL-SA-142114
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
Journal of Nuclear Materials
Additional Journal Information:
Journal Volume: 526
Country of Publication:
United States
Language:
English
Subject:
MBE thin films, TEM, PAS, Self-ion Irradiation, Fe thin films

Citation Formats

Xu, Ke, Weber, Marc, Cao, Yue, Jiang, Weilin, Edwards, Danny J., Johnson, Bradley R., and McCloy, John S. Ion irradiation induced changes in defects of iron thin films: electron microscopy and positron annihilation spectroscopy. United States: N. p., 2019. Web. doi:10.1016/j.jnucmat.2019.151774.
Xu, Ke, Weber, Marc, Cao, Yue, Jiang, Weilin, Edwards, Danny J., Johnson, Bradley R., & McCloy, John S. Ion irradiation induced changes in defects of iron thin films: electron microscopy and positron annihilation spectroscopy. United States. doi:10.1016/j.jnucmat.2019.151774.
Xu, Ke, Weber, Marc, Cao, Yue, Jiang, Weilin, Edwards, Danny J., Johnson, Bradley R., and McCloy, John S. Sun . "Ion irradiation induced changes in defects of iron thin films: electron microscopy and positron annihilation spectroscopy". United States. doi:10.1016/j.jnucmat.2019.151774.
@article{osti_1572671,
title = {Ion irradiation induced changes in defects of iron thin films: electron microscopy and positron annihilation spectroscopy},
author = {Xu, Ke and Weber, Marc and Cao, Yue and Jiang, Weilin and Edwards, Danny J. and Johnson, Bradley R. and McCloy, John S.},
abstractNote = {Single crystal Fe thin films (~250 nm) were grown on MgO substrates and irradiated with 2.0 MeV Fe+ ions at 10 and 50 dpa, and the defect evolution was studied using high resolution Transmission Electron Microscopy (HR-TEM) and Doppler Broadening Positron Annihilation Spectroscopy (PAS). It was shown that irradiation induced or exacerbated a thin oxide layer at the outer interface and produced substantial Fe/Mg mixing at the film/substrate interface, particularly for the higher dose. Modeling of the PAS data allowed interpretation of the defect types at different distances from the Fe surface, and included several types of MgO substrate damage and annihilation condition changes, indicative of damage due to ballistic effects of the Fe atoms as well as chemical changes due to implantation and subsequent diffusion. This detailed PAS study compared with TEM and energy dispersive spectroscopy (EDS) provides significant insight into depth dependent defect creation. These results will be useful for predicting defect creation in Fe-based materials under irradiation conditions, for extension to neutron irradiated structural materials.},
doi = {10.1016/j.jnucmat.2019.151774},
journal = {Journal of Nuclear Materials},
number = ,
volume = 526,
place = {United States},
year = {2019},
month = {12}
}