The Mechanism of the First Hydration-Dehydration Cycle of Pure α- and β-CaSO₄•0.5H₂O

Figure 5

SEM images pure β-HH and β-HH after the first cycle before and after hydration: (a, b) pure β-HH before and after hydration, respectively, and (c, d) β-HH after the first cycle before and after hydration, respectively.

(a)

(b)

(c)

(d)