Abstract
The dehydration of gypsum (CaSO4·2H2O) into calcium sulfate hemihydrate (CaSO4·0.5H2O) and anhydrites (γ-CaSO4andβ-CaSO4) was carried out by heating under a constant pressure of water vapor using Controlled transformation Rate Thermal Analysis. No intermediate formation of calcium sulfate hemihydrate occurred under a pressure of water vapor of 1 and 500 Pa (at the slow reaction rates used), whereas the transformation of gypsum into calcium sulfate hemihydrate was observed at 900 Pa. This transformation occurred without any lattice transformation when micron-sized needle-shaped crystals of gypsum were used, although a partial lattice transformation was observed when the starting sample was a centimeter-sized single crystal of gypsum.
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