材料期刊网

ZrSiO(4) and coesite were obtained under high-pressure and high-temperature from the nano precursor of alpha-SiO(2) and ZrO(2). XRD and Raman measurements indicate that ZrSiO(4) was formed at a temperature higher than 920 degrees C under a pressure of 3.6 GPa. As the pressure increased to 3.9 GPa, the ZrSiO(4) formation temperature was reduced to 815 degrees C. The formation temperature for coesite was 990 degrees C under 3.9 GPa. The lower formation temperature for ZrSiO(4), as compared to that for coesite, provided an experimental evidence that the coesite in the Earth's surface usually occurs as inclusions in ZrSiO(4).