Studies in the system calcium sulphate/water. Part 5.—Surface area and porosity changes in the dehydration of calcium sulphate dihydrate
- 1 January 1977
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases
- Vol. 73, 932-941
- https://doi.org/10.1039/f19777300932
Abstract
Changes in surface area and porosity caused by heating calcium sulphate dihydrate have been studied by nitrogen sorption at 77 K, with limited oxygen and argon studies at the same temperature. Hysteresis is observed, mainly in hexagonal CaSO4, but the observed increases in surface area are not accompanied by marked increases in porosity. Sintering, with a consequent reduction in surface area is only observed in orthorhombic CaSO4. The oxygen and argon sorption results are interpreted in the light of previous work.Keywords
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