How Much Water Does Calcined Gypsum Contain?


  • We thank the company KNAUF for a sample of CaSO4⋅0.5 H2O and also Dr. Manfred Zabel, University of Regensburg, for the time at the single-crystal diffractometer.


Ordered water: Gypsum has been used for construction for millennia. The structure and water content of calcined gypsum, CaSO4⋅0.5 H2O, has been under discussion until now: single-crystal structure analysis (see picture: S yellow, Ca gray, O blue, H red) provides an ordered model that is confirmed by DFT calculations.

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