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,• IV. Solid Allotrones It is not easy to determine howmany solid sulphur·allotropes can exist, how many have been observed or how many have been described. An analysis (40) of many thousand publications on sulphur allotropes shows . that at periodic intervals scientists have, for over one hundred and fifty years, changed back and forth between the belief that only two or three forms can really exist, and they believe sulphur can appear in many dozens ·of form. A. ·Nomenclature :~ ., ... names and allotropes. (Table VI) l\1uch confusion could be prevented if a · clear distinction between molecular species (catena-s8; cyclo-s8, etc.) and intermolecular polymorph;:; (S , S . , S ) would be generally accepted. 0 ex f-' -y The latter always should be completely and unambiguously described with ·.··. space group and/or trivial names to prevent misunderstandings between such forms as f3 and -y, which are both monoclinic. The most profound confusion · stems, however, from incompletely characterized and analyzed mixtures which often, because of their great complexity, are reported as new allo-~ tropes. Such systems can 11su.ally not easily.be r.eproduced and their description leads then often to endles::: controversy in 'the literature• .. .J •.' '· ·.·-- -1.5- A clear mirror of thi::; l.J.ncertain~y is the nomenclature (41). The complete Greek alphabet, almost all colors and many trivial names were . employed to designate allotropes, but nevertheless there is literally not · one single allotrope for which one name has been generally accepted. The situation·is reviewed in a recent arti~le where criteria have been established for sensible naming of alJ.otroJX!S. He reproduce here a list of well-derived . •.: -· ..·,,1:PDF Image | ELEMENTAL SULPHUR
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