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Figure 1
New high-pressure structures of sulfur found by high-pressure powder diffraction. The eight-member rings (S-I, top) break down at 1.5 GPa to form first a triangular chain structure (S-II; left), a novel square chain structure (S-III; right), and then, above 86 GPa, an incommensurate phase (bottom), which is superconducting. A similar sequence is found in Se (Degtyareva, Gregoryanz, Somayazulu, Dera et al., 2005BB26; Degtyareva, Gregoryanz, Somayazulu, Mao & Hemley, 2005BB27).

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 12| Part 2| February 2005| Pages 135-154
doi:10.1107/S0909049504034417
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