Calcium sulphate dihydrate

The dehydration and interconversion reactions of the various forms of calcium sulphate [dihydrate, hemihydrate (a and 3 pseudo morphs) and anhydrous salt (hexagonal and orthorhombic structures)] have been studied by Ball et al. [281,590,591] who compared their observations with the available rate and microscopic data. The important features of the complicated behaviour found are summarized in the scheme [281]... [Pg.132]

Hoa, L.T. Crystallization Kinetics of Calcium Sulphate Dihydrate from Phosphoric Acid Solutions, M.Eng.Sc. Thesis, Uni. of Queensland, 1974. [Pg.315]

Calcium sulphate dihydrate [10101 -41 -4J M 172.1, d2.32. Loses only part of its H2O at 100-150°. Soluble in H2O and very slowly soluble in glycerol. Insoluble in most organic solvents. [Pg.375]

Twinning. Two or more crystals of the same species are sometimes found joined together at a definite mutual orientation, this orientation of the individual crystals being constant in different examples of any one species. Such crystals are said to be twinned. Certain species show this phenomenon frequently, and some species invariably. The most frequent type of twinning is that of calcium sulphate dihydrate (gypsum), which is often found in the form shown in Fig. 41 a. The two crystals appear to be joined at the 100 plane. At the junction there is presumably a sheet of atoms common to the two individuals when the crystal nucleus was formed, two lattices were probably built by deposition on opposite sides of this common sheet of atoms. [Pg.59]

Calcium sulphate dihydrate (microscope) test This is an excellent confirmatory test for calcium in Group IV it involves the use of a microscope (magnification about 110 x). The salts should preferably be present as nitrates. [Pg.285]

Calcium sulphate dihydrate Gypsum CaS04-2H20 CSH2 2-5... [Pg.189]

Fernandez E, Vlad MD, Gel MM, Lopez J, Torres R, Cauich JV, et al. Modulation of porosity in apatitic cements by the use of alpha-tricalcium phosphate-calcium sulphate dihydrate mixtures. Biomaterials. 2005 Jun 26(17) 3395—404. [Pg.43]

J. Kontrec, D. Kralj, and L. Brecevic, Transformation of Anhydrous Calcium Sulphate into Calcium Sulphate Dihydrate in Aqueous Solutions, Journal of Crystal Growth, 240 (2002), 203-211. [Pg.388]

Christoffersen, J. Christoffersen, M. R. (1976). The kinetics of calcium sulphate dihydrate in water. J. Ciystal Growth., 35, 79-88. [Pg.126]

Hexane. 3500—1300 cm. Thin film 2-Methylpentane. 3500—1300 cm . Thin film Dec-l-ene. 3500—1300 cm. Thin film /rfl 5-Stilbene. 1300—400 cm". KBr disc Styrene. 3500—1300 cm". Thin film Styrene 1300—400 cm". Thin film Phenyl Acetylene. 3500—1300 cm". Thin film Phenyl Acetylene. 1300—400 cm". Thin film Aromatic substitution patterns. 2000—1600 cm" para-Cresol. 3500—1300 cm". I.M. CCI4 solution tert-Butyl methyl ketone. 4000—650 cm". Thin film -Heptaldehyde. 4000—650 cm". Thin film Di-/sopropyl ether. 4000—650 cm". Thin film Acetic Anhydride. 4000—650 cm". Thin film Propionic acid. 4000—650 cm". Thin film Propionic acid. 3500—2000 cm". Solution 0.005M CCI4 Methyl salicylate. 4000—650 cm . Thin film n-Butylamine. 4000—650 cm". Thin film Benzamide. 3500—1300 cm". KBr disc Methionine. 4000—650 cm". KBr disc Benzonitrile. 3500—1300 cm". Thin film Benzonitrile. 1300—400 cm". Thin film A-Methyl acetamide. 3500—650 cm". Thin film Methyl acrylate. 4000—650 cm". Thin film Benzoyl chloride. 4000—650 cm". Thin film Triphenyl phosphate. 3500—1300 cm". Melt Triphenyl phosphate. 1300—400 cm". Melt Di-wopropyl sulphone. 4000—650 cm". Melt Nitrobenzene. 4000—650 cm". Thin film Dimethyl sulphoxide. 4000—650 cm". Thin film Polymeric silicone. 4000—650 cm". Thin film Calcium sulphate Dihydrate. 4000—650 cm". KBr disc... [Pg.2]

Calculate the relative molecular mass Mr of calcium sulphate dihydrate CaS04 2H2O and of tricalcium aluminate 3CaO AI2O3 ... [Pg.24]

Boeyens, J. C. A., and V. V. H. Ichharam (2002). Redetermination of the Crystal Structure of Calcium Sulphate Dihydrate, CaS04-2H20 . Zeitschrift fur Kristallographie — New Crystal Structures 217 9-10. [Pg.153]

Hudson-Lamb, D. L., C. A. Strydom and J. H. Potgieter (1996). The thermal dehydration of natural gypsum and pure calcium sulphate dihydrate (gypsum) . Thermochimica Acta 282-283 483—492. [Pg.209]

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