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... Reference books and the literature are full of general d~scriptions of sulphur. ~st all of these data are "overall", average values of more or less representative allotropic mixtures_, which usually contain at least. 3 forms: orthorhombic (o:), monoclinic (t3), and polymeric • suiphur•. Very little is known about the properties of pure allotropic forms, and still less about the anisotropic behaviour of the ,crystalline . .. ' ·~ ~ . Clabough and Gilchrist (11) developed, for example, a process during which ·· impurities are oxidized. The samples are then washed with water -and dried. Such a sample was recently used for heat capacity measurements (12). (J ,.,· -4- Very precise results were obtained, and a very small, before unknown, transition was found at 10l°C. Studies presently in progress did not lead to reproduction of this transition (13). It seems that the observa- tion was caused by traces of water introduced during the above mentioned treatment. Samples have often been prepared by recrystallization from solvents. · In this way big crystalq can be obtained (14),.but solvent inclusions (cs ) have for many years led to new interpretation of the IR spectrum 2 of pure sulphur (15). A very elegant purification method was invented by von Wartenberg .(16), who obtainsa high purity s'ample by immersion of a red hot quartz · heater into the liquid. In this way organic impurities decompose and escape as cs2, so2, and co2• ~ · In recent years 99·9999% (6N) sulphur has become commercially ·available. The samples are usually obtaineq. by a combination of methods, the most popular of which presently is zone melting (17). Analytical methods have been developed to handle the control of high purity samples (18). C. General Properties: .·~PDF Image | ELEMENTAL SULPHUR
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