Time constant of defect relaxation in ion-irradiated 3C-SiC

Above room temperature, the buildup of radiation damage in SiC is a dynamic process governed by the mobility and interaction of ballistically generated point defects. Here, we study the dynamics of radiation defects in 3C-SiC bombarded at 100 °C with 500 keV Ar ions, with the total ion dose split in...

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Bibliographic Details
Published in:Applied physics letters 2015-05, Vol.106 (20)
Main Authors: Bayu Aji L B, Shao, L, Kucheyev, S O
Format: Article
Language:English
Subjects:
Applied physics
Channeling
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Defect annealing
Dynamic annealing
High temperature
Ion bombardment
Lattices (mathematics)
Point defects
Radiation damage
Relaxation time
Subgroups
Time constant
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Summary:Above room temperature, the buildup of radiation damage in SiC is a dynamic process governed by the mobility and interaction of ballistically generated point defects. Here, we study the dynamics of radiation defects in 3C-SiC bombarded at 100 °C with 500 keV Ar ions, with the total ion dose split into a train of equal pulses. Damage–depth profiles are measured by ion channeling for a series of samples irradiated under identical conditions except for different durations of the passive part of the beam cycle. Results reveal an effective defect relaxation time constant of ∼3 ms (for second order kinetics) and a dynamic annealing efficiency of ∼40% for defects in both Si and C sublattices. This demonstrates a crucial role of dynamic annealing at elevated temperatures and provides evidence of the strong coupling of defect accumulation processes in the two sublattices of 3C-SiC.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4921471