Effect of Si-OH on the transformation of amorphous SiO2 to coesite

The crystallization of amorphous SiO2 with different forms of H2O under high pressure and high temperature was investigated experimentally, and it was first discovered that Si-OH could effectively promote the synthesis of coesite at lower temperature in a very short time. Using amorphous SiO2 with Si-OH as the initial material, single-phase coesite has been synthesized under 4.2 GPa and 190 °C for 30 min.