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Thermal behaviour and kinetics of dehydration of gypsum in air from in situ real-time laboratory parallel-beam X-ray powder diffraction

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Abstract

Thermal behaviour and kinetics of dehydration of gypsum in air have been investigated using in situ real-time laboratory parallel-beam X-ray powder diffraction data evaluated by the Rietveld method. Thermal expansion has been analysed from 298 to 373 K. The high-temperature limits for the cell edges and for the cell volume, calculated using the Einstein equation, are 4.29 × 10−6, 4.94 × 10−5, 2.97 × 10−5, and 8.21 × 10−5. Thermal expansion of gypsum is strongly anisotropic being larger along the b axis mainly due to the weakening of \( {\text{H}}{2} \cdots {\text{O}}{1} \) hydrogen bond. Dehydration of gypsum has been investigated in isothermal conditions within the 348–403 K range with a temperature increase of 5 K. Dehydration proceeds through the CaSO4·2H2O → CaSO4·0.5H2O → γ-CaSO4 steps. Experimental data have been fitted with the Avrami equation to calculate the empirical activation energy of the process. No change in transformation mechanism has been observed within the analysed temperature range and the corresponding E a is 109(12) kJ/mol.

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Acknowledgment

This work received financial support by Università di Roma “La Sapienza”.

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  1. Dipartimento di Scienze della Terra, Università di Roma “La Sapienza”, P.le Aldo Moro 5, 00185, Rome, Italy

    Paolo Ballirano & Elisa Melis

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  1. Paolo Ballirano
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Correspondence to Paolo Ballirano.

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Ballirano, P., Melis, E. Thermal behaviour and kinetics of dehydration of gypsum in air from in situ real-time laboratory parallel-beam X-ray powder diffraction. Phys Chem Minerals 36, 391–402 (2009). https://doi.org/10.1007/s00269-008-0285-8

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