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Title: Non-monotonic temperature dependence of radiation defect dynamics in silicon carbide

Journal Article · · Scientific Reports
DOI: https://doi.org/10.1038/srep30931 · OSTI ID:1297652
 [1];  [2];  [3];  [1]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Texas A&M Univ., College Station, TX (United States)
  3. Texas A&M Univ., College Station, TX (United States)

Understanding response of solids to particle irradiation remains a major materials physics challenge. This applies even to SiC, which is a prototypical nuclear ceramic and wide-band-gap semiconductor material. The lack of predictability is largely related to the complex, dynamic nature of radiation defect formation. Here, we use a novel pulsed-ion-beam method to study dynamic annealing in 4H-SiC ion-bombarded in the temperature range of 25–250 °C. We find that, while the defect recombination efficiency shows an expected monotonic increase with increasing temperature, the defect lifetime exhibits a non-monotonic temperature dependence with a maximum at ~100 °C. This finding indicates a change in the dominant defect interaction mechanism at ~100 °C. As a result, the understanding of radiation defect dynamics may suggest new paths to designing radiation-resistant materials.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC52-07NA27344
OSTI ID:
1297652
Report Number(s):
LLNL-JRNL--677429
Journal Information:
Scientific Reports, Journal Name: Scientific Reports Vol. 6; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (5)

Dynamic annealing in Ge studied by pulsed ion beams journal October 2017
Impact of pre-existing disorder on radiation defect dynamics in Si journal August 2019
Effects of collision cascade density on radiation defect dynamics in 3C-SiC journal March 2017
Impact of pre-existing disorder on radiation defect dynamics in Si journal August 2019
Radiation defect dynamics in GaAs studied by pulsed ion beams journal July 2018

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