Fig. 1. Crystal structure of dicyandiamide

Fig. 2. Raman spectrum of dicyandiamide

Fig. 3. Isomers structures of dicyandiamide
(a): Imino form ; (b): Amino form

Fig. 4. High-pressure Raman spectra of dicyandiamide (0~2 300 cm^-1)

Fig. 5. Raman spectra of dicyandiamide at 3 000~3 800 cm^-1

Fig. 6. Plots for frequency-pressure relationships

Fig. 7. Intensity ratio-pressure curve of dicyandiamide (amino form to imino form)
Iν1: Amino form; Iν2: Imino form