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Science 19 May 1978:
Vol. 200. no. 4343, pp. 765 - 766
DOI: 10.1126/science.200.4343.765
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Articles

A New High-Pressure Form of Sulfur Derived from the Decomposition of S4N4

GARY C. VEZZOLI 1 and JAMES ABEL 1

1 U.S. Army Armament Research and Development Command, Applied Sciences and Energetic Materials Divisions, Dover, New Jersey 07801

A new phase of sulfur is formed from S4N4 held at pressure-temperature conditions in the vicinity of the boundary representing the decomposition of S4N4 to fibrous sulfur, Sx. The new phase is gray-black, is persistently metastable at room conditions, and is insoluble in carbon disulfide. The phase is apparently formed from a stage of decomposition during which high-conductance transients are observed in in situ electrical experiments. The sulfur phase appears to form upon the release of the nitrogen from a sulfur-nitrogen chain that is produced from the scission of an S4N4 ring.

Submitted on January 6, 1978

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Science. ISSN 0036-8075 (print), 1095-9203 (online)