Pressure measurement using the R fluorescence peaks and 417 cm⁻¹ Raman peak of an anvil in a sapphire-anvil cell

Abstract

In this study, synthetic sapphire crystals were used as anvils, coupled with a metal gasket, in a Merrill–Bassett-type pressure cell (sapphire-anvil cell (SAC)). Quartz and ruby chips were compressed in the cell and used as pressure calibrators for the SAC. In the sample–anvil interface, the relationship of the frequency shifts of the R1, R2 and 417 cm⁻¹ peaks with pressure was studied. They were constructed as new pressure calibrators. To test the applicability of the newly calibrated SAC, the Raman spectra of dolomite and calcite were measured in situ at room temperature.

Keywords:

• sapphire anvil
• pressure calibration
• sapphire-anvil cell

Acknowledgements

Figure 8. The variations in FWHM for the R1 and R2 peaks of the anvil with pressure in the different parts of the sample–anvil interface, “0”: the center, “40”: 40 μm distance from the center and “80”: 80 μm distance from the center: (a) R1 and (b) R2.

We thank Prof. Lin-gun Liu for his help during the research and comments and the reviewer for his/her comments.