Yttrium hydride

Yttrium hydride is a compound of hydrogen and yttrium. It exists in several forms, the most common being a metallic compound with formula YH2. YH2 has a face centred cubic structure. Under great pressure, extra hydrogen can combine to yield an insulator with a hexagonal structure, with a formula close to YH3.[1] Hexagonal YH3 has a band gap of 1.8 eV. Under pressure of 12 GPa YH3 transforms to an intermediate state, and when the pressure increases to 22 Gpa another metallic face centred cubic phase is formed.[2]

References

  1. ↑ Kume, Tetsuji; Ohura, Hiroyuki; Takeichi, Tomoo; Ohmura, Ayako; Machida, Akihiko; Watanuki, Tetsu; Aoki, Katsutoshi; Sasaki, Shigeo; Shimizu, Hiroyasu; Takemura, Kenichi (31 August 2011). "High-pressure study of ScH3: Raman, infrared, and visible absorption spectroscopy". Physical Review B 84 (6). doi:10.1103/PhysRevB.84.064132.
  2. ↑ Machida, Akihiko (2007). "Unique Structures in Yttrium Trihydride at High Pressure" (PDF). Research Frontiers. SPring 8. pp. 58–59. Retrieved 1 December 2015.
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