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Title: Irradiation-induced grain growth and defect evolution in nanocrystalline zirconia with doped grain boundaries

Journal Article · · Physical Chemistry Chemical Physics. PCCP
DOI:https://doi.org/10.1039/C6CP01763K· OSTI ID:1337107
 [1];  [2]; ORCiD logo [3];  [3];  [4];  [3];  [5];  [1];  [1]
  1. Univ. of California, Davis, CA (United States). Department of Materials Science and Engineering & NEAT ORU
  2. Arizona State Univ., Tempe, AZ (United States). John Cowley Center for HREM, LE-CSSS
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Materials Science and Technology Division
  4. Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Materials Physics and Applications Division
  5. Univ. of Oregon, Eugene, OR (United States). Department of Chemistry and Biochemistry

Grain boundaries are effective sinks for radiation-induced defects, ultimately impacting the radiation tolerance of nanocrystalline materials (dense materials with nanosized grains) against net defect accumulation. However, irradiation-induced grain growth leads to grain boundary area decrease, shortening potential benefits of nanostructures. A possible approach to mitigate this is the introduction of dopants to target a decrease in grain boundary mobility or a reduction in grain boundary energy to eliminate driving forces for grain growth (using similar strategies as to control thermal growth). Here, in this study, we tested this concept in nanocrystalline zirconia doped with lanthanum. Although the dopant is observed to segregate to the grain boundaries, causing grain boundary energy decrease and promoting dragging forces for thermally activated boundary movement, irradiation induced grain growth could not be avoided under heavy ion irradiation, suggesting a different growth mechanism as compared to thermal growth. Furthermore, it is apparent that reducing the grain boundary energy reduced the effectiveness of the grain boundary as sinks, and the number of defects in the doped material is higher than in undoped (La-free) YSZ.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1337107
Report Number(s):
LA-UR-16-23776
Journal Information:
Physical Chemistry Chemical Physics. PCCP, Vol. 18, Issue 25; ISSN 1463-9076
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 19 works
Citation information provided by
Web of Science

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Cited By (4)

Radiation tolerance of La-doped nanocrystalline steel under heavy-ion irradiation at different temperatures journal October 2018
Defect‐fluorite Gd 2 Zr 2 O 7 ceramics under helium irradiation: Amorphization, cell volume expansion, and multi‐stage bubble formation journal February 2019
He irradiation‐induced lattice distortion and surface blistering of Gd 2 Zr 2 O 7 defect‐fluorite ceramics journal January 2020
Different Radiation Tolerances of Ultrafine-Grained Zirconia–Magnesia Composite Ceramics with Different Grain Sizes journal August 2019

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