In the last two or three years, the significant advances in the study of hydrogen and its compounds under extreme conditions (ultrahigh pressures over a wide temperature range) have notably improved the hydrogen phase diagram, provided a breakthrough in understanding hydrides under pressure (as exemplified by the discovery of high-temperature superconductivity in hydrogen sulfide), and, finally, enabled cold metallization of hydrogen. The situation prior to the 2010s is reviewed in brief and more recent work is examined in detail. While the primary focus is on experimental research, mention is also made of theoretical and numerical work it stimulates.

Keywords: hydrogen, deuterium, high pressure, phase diagram, superconductivity PACS: 07.35.+k, 61.50.Ks, 62.50.−p, 64.70.K−, 67.63.−r, 67.80.F−, 67.80.ff, 74.62.Fj, 81.40.Vw (all) DOI: 10.3367/UFNe.2017.02.038077 URL: https://ufn.ru/en/articles/2017/9/b/ 000417704200002 2-s2.0-85040997390 2017PhyU...60..886U Citation: Utyuzh A N, Mikheyenkov A V "Hydrogen and its compounds under extreme pressure" Phys. Usp. 60 886–901 (2017) BibTexBibNote ® (generic)BibNote ® (RIS)MedlineRefWorks Received: 12th, August 2016, revised: 19th, February 2017, accepted: 20th, February 2017 Оригинал: Утюж А Н, Михеенков А В «Водород и его соединения при экстремальных давлениях» УФН 187 953–970 (2017); DOI: 10.3367/UFNr.2017.02.038077