For investigating kinetic behavior of pressure induced phase transitions, it is the most expected to combine high time-resolved diagnostic probes with the precise compression techniques. In fact, an indirect way in large volume press is compare characterization results of recovered samples with their experienced conditions including pressure, temperature and time. As a typical example, relationship between p-T conditions and time for diamond nucleation in C-H-O system is discussed by previous experimental data, demonstrated that extending loading time under HP/HT is propitious to form high pressure stable phase. In contrast, some meta-stable phases, such as bulk amorphous sulfur, metallic glasses and amorphous polymers etc., were obtained by rapid compression process. The results indicated that many substances can show the kinetic features of phase transition in the scale of compression rate from 1 GPa to 1 TPa/s. The kinetic phase diagrams with three dimensions (pressure, temperature and time) could be established through both of the static or rapid compression experiments.

pressure induced phase transition  /  time dependence  /  kinetics of phase transition