Microstructure changes and thermal conductivity reduction in UO2 following 3.9 MeV He2+ ion irradiation

Janne Pakarinen; Marat Khafizov; Lingfeng He; Chris Wetteland; Jian Gan; Andrew T. Nelson; David H. Hurley; Anter El-Azab; Todd R. Allen

doi:10.1016/j.jnucmat.2014.07.053

Microstructure changes and thermal conductivity reduction in UO₂ following 3.9 MeV He²⁺ ion irradiation

Janne Pakarinen, Marat Khafizov, Lingfeng He, Chris Wetteland, Jian Gan, Andrew T. Nelson, David H. Hurley, Anter El-Azab, Todd R. Allen

Research output: Contribution to journal › Article › peer-review

38 Scopus citations

Abstract

The microstructural changes and associated effects on thermal conductivity were examined in UO₂ after irradiation using 3.9 MeV He²⁺ ions. Lattice expansion of UO₂ was observed in X-ray diffraction after ion irradiation up to 5 × 10¹⁶ He²⁺/cm ² at low-temperature (<200 °C). Transmission electron microscopy (TEM) showed homogenous irradiation damage across an 8 μm thick plateau region, which consisted of small dislocation loops accompanied by dislocation segments. Dome-shaped blisters were observed at the peak damage region (depth around 8.5 μm) in the sample subjected to 5 × 10 ¹⁶ He²⁺/cm², the highest fluence reached, while similar features were not detected at 9 × 10¹⁵ He ²⁺/cm². Laser-based thermo-reflectance measurements showed that the thermal conductivity for the irradiated layer decreased about 55% for the high fluence sample and 35% for the low fluence sample as compared to an un-irradiated reference sample. Detailed analysis for the thermal conductivity indicated that the conductivity reduction was caused by the irradiation induced point defects.

Original language	English
Pages (from-to)	283-289
Number of pages	7
Journal	Journal of Nuclear Materials
Volume	454
Issue number	1-3
DOIs	https://doi.org/10.1016/j.jnucmat.2014.07.053
State	Published - Nov 2014
Externally published	Yes

Funding

This work was supported as a part of the Center for Materials Science of Nuclear Fuel, an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences. The FIB and TEM work was supported by the U.S. Department of Energy, Office of Nuclear Energy under DOE Idaho Operations Office Contract DE-AC07-051D14517, as part of an ATR National Scientific User Facility experiment.

Funders	Funder number
U.S. Department of Energy	DE-AC07-051D14517
Office of Science
Office of Nuclear Energy
Basic Energy Sciences

Access to Document

10.1016/j.jnucmat.2014.07.053

Cite this

@article{e6428ca539ec43e59b85a70bbadc0047,

title = "Microstructure changes and thermal conductivity reduction in UO2 following 3.9 MeV He2+ ion irradiation",

abstract = "The microstructural changes and associated effects on thermal conductivity were examined in UO2 after irradiation using 3.9 MeV He2+ ions. Lattice expansion of UO2 was observed in X-ray diffraction after ion irradiation up to 5 × 1016 He2+/cm 2 at low-temperature (<200 °C). Transmission electron microscopy (TEM) showed homogenous irradiation damage across an 8 μm thick plateau region, which consisted of small dislocation loops accompanied by dislocation segments. Dome-shaped blisters were observed at the peak damage region (depth around 8.5 μm) in the sample subjected to 5 × 10 16 He2+/cm2, the highest fluence reached, while similar features were not detected at 9 × 1015 He 2+/cm2. Laser-based thermo-reflectance measurements showed that the thermal conductivity for the irradiated layer decreased about 55% for the high fluence sample and 35% for the low fluence sample as compared to an un-irradiated reference sample. Detailed analysis for the thermal conductivity indicated that the conductivity reduction was caused by the irradiation induced point defects.",

author = "Janne Pakarinen and Marat Khafizov and Lingfeng He and Chris Wetteland and Jian Gan and Nelson, {Andrew T.} and Hurley, {David H.} and Anter El-Azab and Allen, {Todd R.}",

year = "2014",

month = nov,

doi = "10.1016/j.jnucmat.2014.07.053",

language = "English",

volume = "454",

pages = "283--289",

journal = "Journal of Nuclear Materials",

issn = "0022-3115",

publisher = "Elsevier",

number = "1-3",

}

TY - JOUR

T1 - Microstructure changes and thermal conductivity reduction in UO2 following 3.9 MeV He2+ ion irradiation

AU - Pakarinen, Janne

AU - Khafizov, Marat

AU - He, Lingfeng

AU - Wetteland, Chris

AU - Gan, Jian

AU - Nelson, Andrew T.

AU - Hurley, David H.

AU - El-Azab, Anter

AU - Allen, Todd R.

PY - 2014/11

Y1 - 2014/11

N2 - The microstructural changes and associated effects on thermal conductivity were examined in UO2 after irradiation using 3.9 MeV He2+ ions. Lattice expansion of UO2 was observed in X-ray diffraction after ion irradiation up to 5 × 1016 He2+/cm 2 at low-temperature (<200 °C). Transmission electron microscopy (TEM) showed homogenous irradiation damage across an 8 μm thick plateau region, which consisted of small dislocation loops accompanied by dislocation segments. Dome-shaped blisters were observed at the peak damage region (depth around 8.5 μm) in the sample subjected to 5 × 10 16 He2+/cm2, the highest fluence reached, while similar features were not detected at 9 × 1015 He 2+/cm2. Laser-based thermo-reflectance measurements showed that the thermal conductivity for the irradiated layer decreased about 55% for the high fluence sample and 35% for the low fluence sample as compared to an un-irradiated reference sample. Detailed analysis for the thermal conductivity indicated that the conductivity reduction was caused by the irradiation induced point defects.

AB - The microstructural changes and associated effects on thermal conductivity were examined in UO2 after irradiation using 3.9 MeV He2+ ions. Lattice expansion of UO2 was observed in X-ray diffraction after ion irradiation up to 5 × 1016 He2+/cm 2 at low-temperature (<200 °C). Transmission electron microscopy (TEM) showed homogenous irradiation damage across an 8 μm thick plateau region, which consisted of small dislocation loops accompanied by dislocation segments. Dome-shaped blisters were observed at the peak damage region (depth around 8.5 μm) in the sample subjected to 5 × 10 16 He2+/cm2, the highest fluence reached, while similar features were not detected at 9 × 1015 He 2+/cm2. Laser-based thermo-reflectance measurements showed that the thermal conductivity for the irradiated layer decreased about 55% for the high fluence sample and 35% for the low fluence sample as compared to an un-irradiated reference sample. Detailed analysis for the thermal conductivity indicated that the conductivity reduction was caused by the irradiation induced point defects.

UR - http://www.scopus.com/inward/record.url?scp=84906833199&partnerID=8YFLogxK

U2 - 10.1016/j.jnucmat.2014.07.053

DO - 10.1016/j.jnucmat.2014.07.053

M3 - Article

AN - SCOPUS:84906833199

SN - 0022-3115

VL - 454

SP - 283

EP - 289

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

IS - 1-3

ER -

Microstructure changes and thermal conductivity reduction in UO₂ following 3.9 MeV He²⁺ ion irradiation

Abstract

Funding

Access to Document

Other files and links

Fingerprint

Cite this