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Title: Cr incorporated phase transformation in Y2O3 under ion irradiation

Abstract

Under irradiation, chemical species can redistribute in ways not expected from equilibrium behavior. In oxide-dispersed ferritic alloys, the phenomenon of irradiation-induced Cr redistribution at the metal/oxide interfaces has drawn recent attention. Here, the thermal and irradiation stability of the FeCr/Y2O3 interface has been systematically studied. Trilayer thin films of 90 nm Fe - 20 at.% Cr (1st layer)/100 nm Y2O3 (2nd layer)/135 nm Fe - 20 at.% Cr (3rd layer) were deposited on MgO substrates at 500 °C. After irradiation, Cr diffuses towards and enriches the FeCr/Y2O3 interface. Further, correlated with Cr redistributed into the oxide, an amorphous layer is generated at the interface. In the Y2O3 layer, the original cubic phase is observed to transform to the monoclinic phase after irradiation. Meanwhile, nanosized voids, with relatively larger size at interfaces, are also observed in the oxide layer. First-principles calculations reveal that Cr substitution of Y interstitials in Y2O3 containing excess Y interstitials is favored and the irradiation-induced monoclinic phase enhances this process. Lastly, our findings provide new insights that may aid in the development of irradiation resistant oxide-dispersed ferritic alloys.

Authors:
ORCiD logo [1];  [1];  [2];  [3]; ORCiD logo [1]; ORCiD logo [1];  [2];  [4]; ORCiD logo [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. New Mexico State Univ., Las Cruces, NM (United States). Dept. of Chemical and Materials Engineering
  3. Idaho National Lab. (INL), Idaho Falls, ID (United States)
  4. Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Materials Science and Engineering
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1352423
Report Number(s):
LA-UR-16-28998
Journal ID: ISSN 2045-2322
Grant/Contract Number:  
AC52-06NA25396
Resource Type:
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 7; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY

Citation Formats

Li, Nan, Yadav, Satyesh Kumar, Xu, Yun, Aguiar, Jeffery, Baldwin, Jon Kevin Scott, Wang, Yongqiang, Luo, Hongmei, Misra, Amit, and Uberuaga, Blas P. Cr incorporated phase transformation in Y2O3 under ion irradiation. United States: N. p., 2017. Web. doi:10.1038/srep40148.
Li, Nan, Yadav, Satyesh Kumar, Xu, Yun, Aguiar, Jeffery, Baldwin, Jon Kevin Scott, Wang, Yongqiang, Luo, Hongmei, Misra, Amit, & Uberuaga, Blas P. Cr incorporated phase transformation in Y2O3 under ion irradiation. United States. doi:10.1038/srep40148.
Li, Nan, Yadav, Satyesh Kumar, Xu, Yun, Aguiar, Jeffery, Baldwin, Jon Kevin Scott, Wang, Yongqiang, Luo, Hongmei, Misra, Amit, and Uberuaga, Blas P. Mon . "Cr incorporated phase transformation in Y2O3 under ion irradiation". United States. doi:10.1038/srep40148. https://www.osti.gov/servlets/purl/1352423.
@article{osti_1352423,
title = {Cr incorporated phase transformation in Y2O3 under ion irradiation},
author = {Li, Nan and Yadav, Satyesh Kumar and Xu, Yun and Aguiar, Jeffery and Baldwin, Jon Kevin Scott and Wang, Yongqiang and Luo, Hongmei and Misra, Amit and Uberuaga, Blas P.},
abstractNote = {Under irradiation, chemical species can redistribute in ways not expected from equilibrium behavior. In oxide-dispersed ferritic alloys, the phenomenon of irradiation-induced Cr redistribution at the metal/oxide interfaces has drawn recent attention. Here, the thermal and irradiation stability of the FeCr/Y2O3 interface has been systematically studied. Trilayer thin films of 90 nm Fe - 20 at.% Cr (1st layer)/100 nm Y2O3 (2nd layer)/135 nm Fe - 20 at.% Cr (3rd layer) were deposited on MgO substrates at 500 °C. After irradiation, Cr diffuses towards and enriches the FeCr/Y2O3 interface. Further, correlated with Cr redistributed into the oxide, an amorphous layer is generated at the interface. In the Y2O3 layer, the original cubic phase is observed to transform to the monoclinic phase after irradiation. Meanwhile, nanosized voids, with relatively larger size at interfaces, are also observed in the oxide layer. First-principles calculations reveal that Cr substitution of Y interstitials in Y2O3 containing excess Y interstitials is favored and the irradiation-induced monoclinic phase enhances this process. Lastly, our findings provide new insights that may aid in the development of irradiation resistant oxide-dispersed ferritic alloys.},
doi = {10.1038/srep40148},
journal = {Scientific Reports},
number = ,
volume = 7,
place = {United States},
year = {2017},
month = {1}
}

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