Abstract
The structural phase transition and dehydration for gypsum were investigated by Raman spectroscopy and electrical conductivity up to ∼12.2 GPa and ∼723 K. A ∼5.8 GPa of phase transition was verified at atmospheric temperature. The variations in the sulfate and hydroxyl Raman shifts and a change in electrical conductivity marked the onset of dehydration. At ∼2.5 GPa, gypsum transformed into bassanite at ∼523 K, and then completely dehydrated to γ-anhydrite at ∼673 K. And furthermore, the gypsum-bassanite and bassanite-anhydrite dehydration boundaries were obtained: P (GPa) = −23.708 + 0.050 T (K) and P (GPa) = −4.907 + 0.011 T (K), respectively.
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