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Science 29 April 1966:
Vol. 152. no. 3722, pp. 644 - 646
DOI: 10.1126/science.152.3722.644
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Articles

Pressure-Induced Phases of Sulfur

S. Geller 1

1 North American Aviation Science Center, Thousand Oaks, California

At least three phases of sulfur may be induced at pressures between 16 and 65 kilobars. A fibrous form obtained at pressures of 27 kilobars and higher appears to be closely related to the form obtained when plastic sulfur is chilled and stretched. Crystals of the fibrous form are orthorhombic with a = 13.8, b = 32.4, and c = 9.25 Å. Thus far the results are in accord with deductions made by Prins and co-workers that the sulfur atoms are arranged in helices with ten atoms and three turns per 13.8-Å period, and that these helices are essentially close-packed. The unit cell contains 16 ten-atom chain lengths. The probable space groups to which the crystal may belong are C c m m, C c 2 m, or C c m 21. These imply that the structure must contain both right- and left-handed helices and that at least half the helices have some disorder about their axes. The other two phases appear to have structures related to that of the fibrous form, but analyses of them has not progressed as far. One of these phases appears to be uohgrsulfur.


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
A New High-Pressure Form of Sulfur Derived from the Decomposition of S4N4.
G. C. VEZZOLI and J. ABEL (1978)
Science 200, 765-766
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Sulfur Melting and Polymorphism under Pressure: Outlines of Fields for 12 Crystalline Phases.
G. C. Vezzoli, G. C. Vezzoli, F. Dachille, and R. Roy (1969)
Science 166, 218-221
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Pressure-Induced Te7S10: A Cocrystallization of Sulfur and Tellurium Helices.
S. Geller (1968)
Science 161, 290-291
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Pressure-Induced Phase of Sulfur-Selenium.
S. Geller and M. D. Lind (1967)
Science 155, 79-80
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