High-pressure Forms
The pressure-temperature (P-T) phase diagram of sulfur is complex. Some researchers have used laser illumination of samples and found that perhaps 3 forms can be photo-induced below 20–30 GPa. In a high-pressure study at ambient temperatures, four forms, termed S-II, S-III, S-IV, S-V have been characterized (α-sulfur being S-I). S-II and S-III are polymeric forms, S-IV and S-V are metallic and are superconductors below 10 K and 17 K, respectively.
Read more about this topic: Allotropes Of Sulfur
Famous quotes containing the word forms:
“The method of authority will always govern the mass of mankind; and those who wield the various forms of organized force in the state will never be convinced that dangerous reasoning ought not to be suppressed in some way.”
—Charles Sanders Peirce (1839–1914)