Pressure induced structural transitions in the potential hydrogen storage compound NH$_{3}$BH$_{3}$

ORAL

Abstract

Ammonia borane has received much attention in recent years as it is reported to have up to 19.6 wt {\%} of hydrogen [1-2]. Hydrogen is released in a three step process when heated above 100$^{\circ}$C. To understand the structural stability of this compound under compression, we have performed high pressure angle dispersive x-ray diffraction experiments up to 27 GPa using synchrotron x-rays at HPCAT, Advanced Photon Source. Two successive pressure induced structural phase transitions were observed. The ambient tetragonal structure transforms to an orthorhombic structure around 1.2 GPa and then to another high pressure phase above 8 GPa. Complementary neutron diffraction experiments performed up to 5 GPa at LANSCE are in good agreement with the x-ray results. The structural details of the high pressure phases will be presented.\\[4pt] [1] Z. Xiong et al., Nature, 7 (2008) pp 034508\\[0pt] [2] J.B.Yang etal., Appl.Phys.Lett, 92 (2008) pp 091916

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Authors

  • Makram Qauder

    HiPSEC, University of Nevada Las Vegas, Department of Physics and astronomy and HiPSEC, University of Nevada Las Vegas, Department of Physics and Astronomy and HiPSEC, University of Nevada Las Vegas, Department of Physics and HiPSEC, University of Nevada Las Vegas, Department of Electrical Engineering, University of Nevada Las Vegas

  • Jianzhong Zhang

    LANSCE

  • Monika Hartl

    Los Alamos National Laboratory, LANSCE

  • Zhijun Lin

    LANSCE, Los Alamos National Laboratory, LANSCE, Lujan Neutron Scattering Center

  • Sven Vogel

    LANSCE

  • Luke Daemen

    Los Alamos National Laboratory, LANSCE-LC, LANL, Los Alamos, NM 87545, USA, LANSCE, Los Alamos National Laboratory, LANSCE, Lujan Neutron Scattering Center

  • Andrew Cornelius

    HiPSEC, University of Nevada Las Vegas, Department of Physics and astronomy and HiPSEC, University of Nevada Las Vegas, Department of Physics and HiPSEC, University of Nevada Las Vegas

  • Malcolm Nicol

    HiPSEC, University of Nevada Las Vegas

  • Yushen Zhao

    LANSCE