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Raman spectra from polycrystalline beta-silicon carbide (SiC) were collected following neutron irradiation at 380–1180°C to 0.011–1.87 displacement per atom. The longitudinal optical (LO) peak shifted to a lower frequency and broadened as a result of the irradiation. The changes observed in the LO phonon line shape and position in neutron-irradiated SiC are explained by a combination of changes in...
Raman spectra of type-I and type-VIII silicon clathrates have been measured at ambient temperature and pressure for Sr 8 Al x Ga 16−x Si 30 alloys prepared by changing the Al/Ga ratio. Although the broadening of Raman bands appeared, due to the disorder of the host framework by replacing the Si sites by Al and Ga atoms, the phase transition from type-I to type-VIII...
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