Combined effects of radiation damage and He accumulation on bubble nucleation in Gd2Ti2O7

Taylor, Caitlin A.; Patel, Maulik K.; Aguiar, Jeffery A.; Zhang, Yanwen; Crespillo, Miguel L.; Wen, Juan; Xue, Haizhou; Wang, Yongqiang; Weber, William J.

doi:10.1016/j.jnucmat.2016.07.043

Title: Combined effects of radiation damage and He accumulation on bubble nucleation in Gd₂Ti₂O₇

Journal Article · Fri Jul 22 00:00:00 EDT 2016 · Journal of Nuclear Materials

DOI:https://doi.org/10.1016/j.jnucmat.2016.07.043· OSTI ID:1396002

Taylor, Caitlin A. ^[1]; Patel, Maulik K. ^[1]; Aguiar, Jeffery A. ^[2]; Zhang, Yanwen ^[3]; Crespillo, Miguel L. ^[1]; Wen, Juan ^[4]; Xue, Haizhou ^[1]; Wang, Yongqiang ^[5]; Weber, William J. ^[6]

The Univ. of Tennessee, Knoxville, TN (United States)
Idaho National Lab. (INL), Idaho Falls, ID (United States); National Renewable Energy Lab. (NREL), Golden, CO (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); The Univ. of Tennessee, Knoxville, TN (United States)
Lanzhou Univ., Gansu (China); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
The Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

We report that pyrochlores have long been considered as host phases for long-term immobilization of radioactive waste nuclides that would undergo α-decay for hundreds of thousands of years. This work utilizes ion-beam irradiations to examine the combined effects of radiation damage and He accumulation on bubble formation in Gd₂Ti₂O₇ over relevant waste-form timescales. Helium bubbles are not observed in pre-damaged Gd₂Ti₂O₇ implanted with 2 × 10¹⁶ He/cm², even after post-implantation irradiations with 7 MeV Au³⁺ at 300, 500, and 700 K. However, He bubbles with average diameters of 1.5 nm and 2.1 nm are observed in pre-damaged (amorphous) Gd₂Ti₂O₇ and pristine Gd₂Ti₂O₇, respectively, after implantation of 2 × 10¹⁷ He/cm². Lstly, the critical He concentration for bubble nucleation in Gd₂Ti₂O₇ is estimated to be 6 at.% He.

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Research Organization:: Idaho National Lab. (INL), Idaho Falls, ID (United States); National Renewable Energy Laboratory (NREL), Golden, CO (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE); USDOE Office of Science (SC)

Grant/Contract Number:: AC07-05ID14517; AC36-08GO28308; AC05-00OR22725; AC52-06NA25396; AC04-94AL85000; NE0000693

OSTI ID:: 1396002

Alternate ID(s):: OSTI ID: 1293805; OSTI ID: 1356959; OSTI ID: 1359432

Report Number(s):: INL/JOU-16-39501; NREL/JA-5K00-66933; PII: S0022311516304536

Journal Information:: Journal of Nuclear Materials, Vol. 479, Issue C; ISSN 0022-3115

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 12 works

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Cited By (2)

He irradiation‐induced lattice distortion and surface blistering of Gd ₂ Zr ₂ O ₇ defect‐fluorite ceramics Huang, Zhangyi; Zhou, Mao; Cao, Zhangkai Journal of the American Ceramic Society, Vol. 103, Issue 5 https://doi.org/10.1111/jace.17030	journal	January 2020
Designing functionality in perovskite thin films using ion implantation techniques: Assessment and insights from first-principles calculations Sharma, Vinit; Herklotz, Andreas; Ward, Thomas Zac Scientific Reports, Vol. 7, Issue 1 https://doi.org/10.1038/s41598-017-11158-4	journal	September 2017

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Title: Combined effects of radiation damage and He accumulation on bubble nucleation in Gd2Ti2O7

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Title: Combined effects of radiation damage and He accumulation on bubble nucleation in Gd₂Ti₂O₇