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Raman spectra taken in normal incidence on different facets of the AlN single crystal. A logarithmic intensity scale is used to show weak features. The symbols denote AlN phonon bands.
Normalized FTIR reflectance spectra measured on different facets of the AlN single crystal.
Peak positions and FWHM values (both in ) of phonon bands detected in the Raman spectra shown in Fig. 1. (-) no peak detected. peak traces detected.
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