Raman scattering of neutron irradiated 6H-SiC

Abstract Confocal micro-Raman spectroscopy was preformed to investigate the structural damage of SiC neutron irradiated with the fluences of 1.72×10 19 and 1.67×10 20  n/cm 2 . In addition to characteristic peaks, several additional signals related to Si–Si, Si–C, and C–C vibration modes were monitored. The vibration mode associated with C Si V C complexes was identified to be the unambiguous peak at 575 cm −1 which appears initially in the sample post-irradiation annealed at 800 °C. The defect-induced phonon confinement effect results in an asymmetric broadening with a low-frequency tail of the optical phonon peaks. The sigmoidal thermal recovery behavior of the optical phonon frequencies indicates that the reduction of FLO 0/6 –FTO 2/6 splitting originates mainly from the isolated vacancies and interstitials.