Phase transition and chemical stability of s-Triazine under static and dynamic compression

The high-pressure behaviors of 1,3,5-triazine (s-triazine) was investigated under static and dynamic compression to elucidate the effects of compression rate on its phase transitions and chemical reactions. Static compression experiments revealed that s-triazine underwent a phase transition from phase I to phase II at 0.69 GPa and initiated chemical reactions above 10.84 GPa. Dynamic compression, however, resulted in a more chemically stable overpressure phase II’, which maintained its structure up to 17.32 GPa. The distinct responses to compression rates suggest that dynamic compression induces metastable structures of s-triazine that consume energy, preventing chemical reactions below the energy threshold. This study highlights the importance of compression rate in determining the chemical and physical properties of s-triazine under high pressure.