Editing Hydrogen sulfide (section)

===Extreme temperatures and pressures===
At pressures above 90&nbsp;GPa ([[gigapascal]]), hydrogen sulfide becomes a metallic conductor of electricity. When cooled below a [[Superconductivity#Superconducting phase transition|critical temperature]] this high-pressure phase exhibits [[superconductivity]]. The critical temperature increases with pressure, ranging from 23&nbsp;K at 100&nbsp;GPa to 150&nbsp;K at 200&nbsp;GPa.<ref name=Drozdov2014>{{Cite arXiv|last1= Drozdov|first1=A.|last2=Eremets|first2=M. I.|last3=Troyan|first3=I. A.|title=Conventional superconductivity at 190 K at high pressures|eprint=1412.0460|year=2014|class=cond-mat.supr-con}}</ref> If hydrogen sulfide is pressurized at higher temperatures, then cooled, the critical temperature reaches {{convert|203|K|°C}}, which was the highest accepted superconducting critical temperature until the discovery of [[Lanthanum decahydride]] in 2019. By substituting a small part of sulfur with phosphorus and using even higher pressures, it has been predicted that it may be possible to raise the critical temperature to above {{convert|0|°C|K}} and achieve [[Room-temperature superconductor|room-temperature superconductivity]].<ref name=cart15>{{cite journal |last1=Cartlidge |first1=Edwin |title=Superconductivity record sparks wave of follow-up physics |journal=Nature |date=August 2015 |volume=524 |issue=7565 |pages=277 |doi=10.1038/nature.2015.18191 |pmid=26289188 |bibcode=2015Natur.524..277C |doi-access=free }}</ref>

Hydrogen sulfide decomposes without a presence of a catalyst under atmospheric pressure around 1200&nbsp;°C into hydrogen and sulfur.<ref>{{cite journal |title=The direct conversion of hydrogen sulfide to hydrogen and sulfur |journal=International Journal of Hydrogen Energy |date=1998 |volume=23 |issue=6 |pages=451–456 |doi=10.1016/S0360-3199(97)00099-2|last1=Faraji |first1=F. |bibcode=1998IJHE...23..451F }}</ref>