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Ordered water: Gypsum has been used for construction for millennia. The structure and water content of calcined gypsum, CaSO(4)0.5 H(2)O, 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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Weiß et al. (2009) studied this question.
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