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tJ ' i. 4' -18- The "sheared penny roll" crystal can be described in three_different ~ys. Using the conventional setting, the space group is P2/c and the lattice constants are (45) 0 a =8.50A, 0 0 b =13.16A 0 0 c =9.29A 0 (30 = J24°.491 The melting point is given as 106.86C. Monoclinic (~) sulphur transforms into monoclinic'(()) and/or into orthorhombic (a) sulphur., These transformation processes have been carefully studied.(52). (d) Transient or Insufficiently Identified Forms A great number of the allotropes of cycloocta sulphur have been described (41), but their-identification is either incomplete or doubtful: (1) Under the microscope a "fourth allotrope of Muthman" can be obtained by quick quenching of molten sulphur. The transformation rates to ~' () and a sulphur have been measured, but very little else is known about this form (52). (2) High pressure forms: Contrary to reports in the literature, sulphur seems not to become metallic, even under pressures up to 400 kbw• . .Recent reports indicate, however, that under high pressures, and at elevated temperatures, new allotropes can be produced (53). These allo- tr~pes reportedly 9an be quenched. According to one author, a cubic ·modification with a de~sityof 2.18 g/cm3 and a unit cell of a =13.66 A 0 is produced•. The triple point (54) cubic-liquid-orthorhombic is given as 300°C and 28 kbs. According to another report·an optically active allo- trope is produced above 3006C and 30 kbs. ,. ... ·. ' ·~··PDF Image | ELEMENTAL SULPHUR
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