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Synthesis of sodium polyhydrides at high pressures

Author

Listed:
  • Viktor V. Struzhkin

    (Geophysical Laboratory, Carnegie Institution of Washington)

  • Duck Young Kim

    (Geophysical Laboratory, Carnegie Institution of Washington
    Center for High Pressure Science and Technology Advanced Research)

  • Elissaios Stavrou

    (Geophysical Laboratory, Carnegie Institution of Washington
    Lawrence Livermore National Laboratory)

  • Takaki Muramatsu

    (Geophysical Laboratory, Carnegie Institution of Washington)

  • Ho-kwang Mao

    (Geophysical Laboratory, Carnegie Institution of Washington
    Center for High Pressure Science and Technology Advanced Research)

  • Chris J. Pickard

    (University College London
    University of Cambridge)

  • Richard J. Needs

    (Theory of Condensed Matter Group, Cavendish Laboratory)

  • Vitali B. Prakapenka

    (Center for Advanced Radiation Sources, The University of Chicago)

  • Alexander F. Goncharov

    (Geophysical Laboratory, Carnegie Institution of Washington
    Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences)

Abstract

The only known compound of sodium and hydrogen is archetypal ionic NaH. Application of high pressure is known to promote states with higher atomic coordination, but extensive searches for polyhydrides with unusual stoichiometry have had only limited success in spite of several theoretical predictions. Here we report the first observation of the formation of polyhydrides of Na (NaH3 and NaH7) above 40 GPa and 2,000 K. We combine synchrotron X-ray diffraction and Raman spectroscopy in a laser-heated diamond anvil cell and theoretical random structure searching, which both agree on the stable structures and compositions. Our results support the formation of multicenter bonding in a material with unusual stoichiometry. These results are applicable to the design of new energetic solids and high-temperature superconductors based on hydrogen-rich materials.

Suggested Citation

  • Viktor V. Struzhkin & Duck Young Kim & Elissaios Stavrou & Takaki Muramatsu & Ho-kwang Mao & Chris J. Pickard & Richard J. Needs & Vitali B. Prakapenka & Alexander F. Goncharov, 2016. "Synthesis of sodium polyhydrides at high pressures," Nature Communications, Nature, vol. 7(1), pages 1-8, November.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms12267
    DOI: 10.1038/ncomms12267
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