Raman spectra were acquired with a micro-Raman (model XploRA ONE from Horiba, Kyoto, Japan) with a grating of 2400 gr/mm, slit of 50 µm, and hole of 500 µm. The employed wavelength was 532 nm. The power density of the laser used for spectra measured at 532 nm was 5.25 mW/µm 2 (bulk crystals) and 170 µW/µm 2 (thin-layers).