Saturation curve of SiO2 component in rutile-type GeO2: A recoverable high-temperature pressure standard from 3Â GPa to 10Â GPa

The saturation curve of SiO2 in TiO2 shows a strong pressure dependence and a strong dependence of unit cell volume on composition. This provides an opportunity to use this saturation curve as a measurement of pressure during a high-pressure experiment. The curve is a sensitive measure of pressure from 3 GPa to 10 GPa at high temperatures. The pressure is derived from lattice parameter measurements on the recovered solid solution, meaning that in-situ measurements are not necessary to evaluate the pressure of the experiment.