Structural Studies of Group IV Binary Hydrides at Extreme Pressures

ORAL

Abstract

Although binary hydrides such as TiH$_{2}$ are not ideal candidates for storing hydrogen, they can act as active species to catalyze the reversible dehydrogenation of other hydrides and of carbon nanotubes. The equation of state of TiH$_{2}$, ZrH$_{2}$ and HfH$_{2}$ was obtained using synchrotron x-ray diffraction and diamond anvil cells, with structural studies carried out \textit{in situ} on compression up to $\sim $50 GPa, under quasi-hydrostatic conditions. We discuss pressure-induced structural transformations and the experimental bulk modulus for TiH$_{2}$, ZrH$_{2}$ and HfH$_{2}$, accompanied by corresponding first principle calculations.

*This work is supported by DOE award DEFG36-05GO08502 and by DOE Cooperative Agreement DE-FC08-01NV14049.

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Authors

  • Patricia Kalita

    • Dept. of Physics and Astronomy, University of Nevada Las Vegas, NV, USA
    • Department of Physics and Astronomy, University of Nevada Las Vegas, NV

  • Andrew Cornelius

    • Department of Physics and Astronomy, University of Nevada Las Vegas, NV, USA

  • Kristina Lipinska

    • Harry Reid Center of Environmental Studies and Dept. of Chemistry, University of Nevada Las Vegas, NV, USA

  • Stanislav Sinogeikin

    • Carnegie Institution of Washington, Washington DC, USA

  • Olga Shebanova

    • Carnegie Institution of Washington, Washington DC, USA

  • Wenge Yang

    • Carnegie Institution of Washington, Washington DC, USA

  • Romeo De Coss

    • Dept. De Fisica Applicada, Centro de Investigation y de Estudios Avanzados del IPN, Unidad Merida, Mexico

  • Ramiro Qijano

    • Dept. De Fisica Applicada, Centro de Investigation y de Estudios Avanzados del IPN, Unidad Merida, Mexico