Thermal Behaviour and Crystal Structure of Sodium-Containing Hemihydrates of Calcium Sulfate View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1999-10-01

AUTHORS

Daniela Freyer, Günter Reck, Martina Bremer, Wolfgang Voigt

ABSTRACT

Summary. A metastable sodium-containing hemihydrate ((6-x)CaSO4ċxNa2SO4ċ3H2O, 0 ≤ x ≤ 1) limited by the pentasalt composition Na2SO4ċ5CaSO4ċ3H2O occurs as an intermediate solid phase in the systems Na2SO4-CaSO4-H2O, NaCl-Na2SO4-CaSO4-H2O, and NaCl-CaSO4-H2O. X-Ray structure determination of a crystal with pentasalt composition results in a super-structure of the pure hemihydrate (CaSO4ċ0.5H2O), in which one Ca2+ion is statistically replaced by two Na+ ions. One Na+ cation is situated in a Ca2+ position in only one of the three chains of CaSO4 forming an axis of nearly three fold symmetry along the c-axis. The second Na+ is located in the water channel neighbouring to the first Na+. The hydrate crystallized in a monoclinic space group C121 (No. 5) with a=24.1781(11), b=13.805(2), c=12.7074(12) Å, β=90.089(12)°. The dehydration temperature of the hydrates depends on their Na+ ion content. A high Na+ content (in water channels) blocks the water escape strongly, and the dehydration temperature increases. Thermal behaviour is also effected by the crystal sizes. The thermograms of small crystals as opposed to large ones show a exothermic effect adjoining the endothermic dehydration. This may be indicative for a change in the dehydration mechanism upon crystal size. More... »

PAGES

1179-1193

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/pl00010180

DOI

http://dx.doi.org/10.1007/pl00010180

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1052599428


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