Research on Raman Spectra of Calcite at Pressure of 0.1~800 MPa

This paper investigates the reliability of calcite as a pressure gauge for the hydrothermal diamond anvil cell (HDAC) by the experiment at the pressure of 0.1~800 MPa and the temperature of 26 ℃, and defines the relation between the pressure and the Raman peak position of calcite in ambient temperature. The result shows that calcite is stable at the experimental pressure, and the intensity of its 1 085 cm-1 Raman peak is two times greater than that of the 464 cm-1 Raman peak of quartz, calcite is reliable as a pressure gauge for the hydrothermal diamond anvil cell. The relation between the system pressure and peak position of calcite (1 085 cm-1) is given as following: p(MPa)=192(p－1 085)－21.8, 1 085 cm-1p1 090 cm-1.