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.;ri - .. .~ forms. Therefore it.seems appropriate here not to list general proper- ties. Reference to these can be found in many hanqbooks (3,·),19)• Several years ago chemical studies of allotropic reactivities were started (20). Reference to these results wHl be made under the individual allotropes. D. Pedigree of Allotropes: At STP only orthorhombic (a:) sulphur is stable. It consists of cycloocta sulphur molecules. On heating orthorhombic (a:) sulphur ·converts to monoclinic (~) sulphur. Table II indicates all the equilibrium forms, and the thermally deduced metastable allotropes. Table III lists polymorphs deduced from solutions containing only cycloocta sulphur. Table IV indicates the allotropes in chemicallyprecipitated sulphur. Exposure to light influences the products greatly. The behaviour of sulphur under pressure has been repeatedly studied. Analytical reviews indicate that a metallic form has not yet ,.,.... been found (21)~ The fusion curves have been determined up to pressure 2 .i ·of 4o,ooo kg/em. The results on very high pressure.allotropes are still contradictory and will be discussed later. ,' ·'. ,,,. ,.. -5-PDF Image | ELEMENTAL SULPHUR
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