Fig. 3: Measured pressure as a function of time for compression rates of 1.6 GPa/ms and 110 GPa/ms.
From: Metastable water at several compression rates and its freezing kinetics into ice VII
At the freezing pressure into ice VII, a rupture in the compression slope is observed due to the negative discontinuity at crystallization. Pressure is measured using the SrB4O7 : Sm2+ fluorescence gauge and in some cases using the volume of a piece of Cu embedded in the sample chamber. The freezing into ice VII is evidenced from the XRD pattern. After freezing, excellent agreement is observed between the pressure measured from the volume of ice VII, the luminescence gauge and the volume of Cu. Good reproducibility of the sample pressure response to a given voltage function driving the piezo-actuator is observed. The quantities ΔP and Δt defined in the text are represented for each run. Note the break in scale for the horizontal axis.
