English
 
User Manual Privacy Policy Disclaimer Contact us
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT

Released

Journal Article

Synthesis of osmium hydride under high hydrogen pressure

MPS-Authors
/persons/resource/persons203187

Minkov,  Vasily S.
High Pressure Group, Max Planck Institute for Chemistry, Max Planck Society;

/persons/resource/persons100925

Eremets,  Mikhail I.
High Pressure Group, Max Planck Institute for Chemistry, Max Planck Society;

External Ressource
No external resources are shared
Fulltext (public)
There are no public fulltexts stored in PuRe
Supplementary Material (public)
There is no public supplementary material available
Citation

Kuzovnikov, M. A., Minkov, V. S., Chariton, S., Prakapenka, V. B., & Eremets, M. I. (2020). Synthesis of osmium hydride under high hydrogen pressure. Physical Review B, 102(21): 214109. doi:10.1103/PhysRevB.102.214109.


Cite as: http://hdl.handle.net/21.11116/0000-0007-9F03-3
Abstract
The osmium-hydrogen system was studied at pressures up to 186 GPa by in situ synchrotron x-ray diffraction in a diamond anvil cell. Hydrogen solubility in the hexagonal close-packed (hcp) osmium metal at room temperature was found to be negligibly small in the studied pressure range. After laser heating of the osmium sample at the maximal H2 pressure, it transformed to hydride with a face-centered cubic (fcc) metal lattice. The equation of state V(P) for this hydride was then measured at room temperature and decreasing pressure. The hydrogen-induced volume expansion of the Os lattice proved to be weakly dependent on the pressure, and its estimated value of 1.35Å3/Os atom at 100 GPa suggested the formation of monohydride OsH with hydrogen atoms occupying all octahedral interstices in its fcc metal lattice. The OsH sample began to gradually lose hydrogen at pressures below about 55 GPa and completely decomposed to hcp-Os and molecular H2 at about 25 GPa.