The amorphization of 3C-SiC irradiated at moderately elevated temperatures as revealed by X-ray diffraction
- Centre Européen de la Céramique, Limoges (France). Science des Procédés Céramiques et Traitements de Surface, CNRS UMR
- Univ. Paris-Sud, Orsay (France). Centre de Sciences Nucleaires et de Sciences de la Matiere (CSNSM); Université Paris-Saclay, Orsay (France)
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Texas A & M Univ., College Station, TX (United States)
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Mechanisms of radiation damage buildup in 3C-SiC remain poorly understood. Here, we use X-ray diffraction in combination with numerical simulations to study depth profiles of radiation-produced strain and lattice damage in 3C-SiC bombarded in the temperature range of 25–200 °C with 500 keV Ar ions. Results reveal increased defect recombination with increasing temperature, with a critical amorphization fluence increasing from 0.17 to 0.44 displacements per atom. The amorphization process is found to be correlated with the evolution of lattice strain. We find that, at fluences corresponding to the onset of amorphization, lattice strain is ~2% and is independent of temperature. With continuing bombardment above the onset of amorphization, the strain in the crystal bulk increases and reaches a saturation value that decreases from 7% to 5% with increasing temperature. Based on strain profiles, we compute depth profiles of the effective concentration of point defect clusters in the crystalline phase. Bombardment at higher temperatures results in lower maximum defect concentrations pointing to enhanced defect mobility.
- Research Organization:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA)
- Grant/Contract Number:
- AC52-07NA27344
- OSTI ID:
- 1840129
- Alternate ID(s):
- OSTI ID: 1549746
- Report Number(s):
- LLNL-JRNL-779360; 973036
- Journal Information:
- Acta Materialia, Vol. 140; ISSN 1359-6454
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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