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Title: Impact of irradiation induced dislocation loops on thermal conductivity in ceramics

Journal Article · · Journal of the American Ceramic Society
DOI:https://doi.org/10.1111/jace.16616· OSTI ID:1767763
ORCiD logo [1];  [2]; ORCiD logo [3];  [4]
  1. The Ohio State Univ., Columbus, OH (United States)
  2. Belgian Nuclear Research Centre (SCK·CEN), Mol (Belgium); Univ. of Wisconsin, Madison, WI (United States)
  3. Univ. of Wisconsin, Madison, WI (United States); Idaho National Lab. (INL), Idaho Falls, ID (United States)
  4. Idaho National Lab. (INL), Idaho Falls, ID (United States)

Experimental work aimed at understanding the role of dislocation loops in limiting phonon mediated thermal transport in ceramics is presented. Faulted dislocation loops, having diameters of a few nanometers, were introduced by irradiating a polycrystalline cerium dioxide sample with 1.6 MeV protons at 700°C. XRD analysis indicated that irradiated samples retained their crystalline structure and exhibit very little lattice expansion suggesting a low concentration of point defects. Additionally, further microstructure characterization using transmission electron microscopy revealed that interstitial type faulted dislocation loops were primarily created as expected for these irradiation conditions. Thermal conductivity of the damaged layer was measured using a modulated thermoreflectance approach. Analysis of the experimental data using the classical Klemens-Callaway approach reveals that the conductivity reduction is primarily due to dislocation loops, while point defects and voids play only a minor role. These results provide experimental confirmation that faulted loops offer a unique arrangement for displaced atoms that leads to an unusually large reduction of thermal conductivity.

Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Center for Thermal Energy Transport under Irradiation (TETI)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC07-05ID14517
OSTI ID:
1767763
Alternate ID(s):
OSTI ID: 1525342
Journal Information:
Journal of the American Ceramic Society, Vol. 102, Issue 12; ISSN 0002-7820
Publisher:
American Ceramic SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 46 works
Citation information provided by
Web of Science

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