A time-resolved neutron powder diffraction investigation of the hydration of CaSO₄.1/2D₂O and of the dehydration of CaSO₄.2D₂O

A chemical reaction, the hydration of CaSO₄.½D₂O, was followed in real time in an on-line neutron diffraction experiment at different temperatures. The results of the reactions are presented as diagrams showing the evolution of the intensities of CaSO₄.2D₂O in real time. The hydration passes through the formation of a gel interphase. The dehydration of CaSO₄.2D₂O was followed in the same way at temperatures up to 420 K.