Experimental study of the dehydration reactions gypsum-bassanite and bassanite-anhydrite at high pressure: indication of anomalous behavior of H(2)O at high pressure in the temperature range of 50-300 degrees C.

The system CaSO(4)-H(2)O, characterized by the three dehydration reactions gypsum-anhydrite, gypsum-bassanite, and bassanite-anhydrite, was reexamined by in situ differential pressure analysis in the temperature range of 60-350 degrees C up to 3.5 GPa pressure. The investigation revealed a fine structure in the dehydration boundaries of gypsum-bassanite and bassanite-anhydrite, each characterized by three inflections at 0.

Isobaric annealing of high-density amorphous ice between 0.3 and 1.9 GPa: in situ density values and structural changes.

We report in situ density values of amorphous ice obtained between 0.3 and 1.9 GPa and 144 to 183 K.