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-- ."• .· .7. have only very recently been studied. Even of the few studied properties .such as the thermal conductivity only few will be of permanent value, since precise measurements will have to take into ac~ou.'1t the anisotropic behaviour. The anisotropic effects are partly quite large: The elastic constants (46) along the C axis are only one quarter that of the value along A and B. The velocity of sound along C is reported to be 150% or' that of A and B (47) and the thermal conductivity (48) in the direction of C is 127% of A and B. Special attention has been recently paid to the . electric and photoconductive properties of orthorhombic (ex) sulphur, and it is likely that these properties,together with the x-ray data, are the best studied characteristics of S (49). The results are, however, still ex ~ . ,...... ..... .. ( . fied Three polymorph of cycle s have been crystallographically identi- 8 (45). contains 128 atoms. are (45) a b The space group is Fddd-D~~and the lattice constants 0 =10.467±0.001 A 0 =12.870±0.001 A 0 0 0 -16- (a) Orthorhombic (ex) sulphur. This form is the STP thermodynamically stable form of sulphur. It is the well known form which can be found in volcanic areas and occurs in large crystals in nature. TI1e crystals can easily be grown from solution but they then include appreciable amounts of solvent. The unit cell c =24.493±0.003A· 0 The density of orthorhombic sulphur is 2.07gfcm3. unspecified properties of sulphur refer to allotropic mixtures, rather ).. .than to the stable orthorhombic (ex) fo~. The properties of the latter ., are astonishingly little known, and its mechanical properties, for example.- (51), · '· Most general and ·PDF Image | ELEMENTAL SULPHUR
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