Schematic drawing (a) and picture (b) of the hydrothermal diamond anvil cell (HDAC) we used in this work.
Photograph of the Reinshaw 1000 Raman spectrometer located in Peking University.
Interface of the PeakFit V4.04 software.
A typical sequence of Raman patterns as a function of time (1322 MPa and 373 K).
Transformed volume fraction X(t) of CaSO4 as a function of time at (a) 896 MPa, 373 K, (b) 984 MPa, 373 K, (c) 1076 MPa, 373 K, (d) 1322 MPa, 373 K. The experimental data (solid squares) are fitted by the Avrami equation.
(a)–(d) Plots of lnln[1/(1−X(t))] versus ln(t) corresponding to the experimental data from Figs. 5(a)–5(d) , respectively.
Plot of −RTlnk versus P using the obtained four values of the rate constant k at 373 K. The fitted straight line yields a volume change (ΔV m ) of −1.82 × 10−5 m3/mol.
Observed n-values and calculated rate constant k at various P-T conditions.
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