The FT-IR/ATR characterizations were performed using a Spectrum Two FT-IR Spectrometer (Perkin Elmer) equipped with a LiTaO3 detector. Measurements were carried out using 16 scans at a 4 cm -1 resolution between 400 and 4000 cm -1 (MIR). For the measurement, the powder was pressed on the crystal with a metal cylinder.