High-temperature and high-pressure cubic zirconia anvil cell for Raman spectroscopy

A simple and inexpensive cubic zirconia anvil cell has been developed for the performance of in situ Raman spectroscopy up to the conditions of 500 degreesC and 30 kbar pressure. The design and construction of this cell are fully described, as well as its applications for Raman spectroscopy. Molybdenum heater wires wrapped around ceramic tubes encircling two cubic zirconia anvils are used to heat samples, and the temperatures are measured and controlled by a Pt-PtRh thermocouple adhered near the sample chamber and an intelligent digital control apparatus. With this cell, Raman spectroscopic measurements have been satisfactorily performed on water at 6000 bar pressure to 455 degreesC and on ice of room temperature to 24 kbar, in which the determinations of pressures make use of changes of the A(1) Raman modes of quartz and the shift of the sharpline (R-line) luminescence of ruby, respectively.