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1 ',i i • J ·' .; , i ...":'.' .-, ' >' .D . The results of more work are needed before the high pressure · characteristics of cycloocta sulphur can be understood (54). A special problem in analyzing high pressure work is that the sulphur, because_of poor heat conductivity, C8.n locally overheat and at least partially trans- form into other molecular units such as polymer chains. It is conceivable that elemental sulphur under high pressure might transform over such an intermediate plastic form into ~igh density forms, such as rhombohedral sulphur, which have a higher density. · · · (3) From solutions, cycloocta sulphur crystallizes in a variety and in a mixture of forms (see Table III). Some selected crystal characteris- tics such as refracti've index and density have been employed as criteria and proof of new allotropes, but it is usually not possible to evaluate these incompletely defined forms. The insuffici~ntly defined forms .are (3,5,6):' ·n., ~ - sulphur, forming reddish-brown crystals cocrystall.izing with selenium (55);'1']- sulphur another isomorph of selenium with a half'- . life· of 10 minutes (55); 8 - sulphur which crystallizes with 'Y sulphur and forms ditetragonal bipyramids with a lifetime of less than one minute · (56); o - sulphur which coprecipitates witl1 a-sulphur and transforms within 'seconds into "{-sulphur (57); monoclinic spirals of ;~-sulphur; ~-sulphur which forms in only one of one thousand experiments if an oxylene solution of sulphur is boiled (58); monoclinic k-sulphur which has an unusually high refractive index, and many other forms (6) which are equally ill defined. It is, however, quite possible that some of these forms, or at least some of their components constitute truly llew allotropes_, the conclusive identification of which wo~~ be quite difficult. -19-PDF Image | ELEMENTAL SULPHUR
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