Journal article

BH₄⁻ self-siffusion in liquid LiBH₄

  • Martelli, Pascal Empa Swiss Federal Laboratories for Materials Science and Technology, Dübendorf, Switzerland - Physics Department, University of Fribourg, Switzerland
  • Remhof, Arndt Empa Swiss Federal Laboratories for Materials Science and Technology, Dübendorf, Switzerland
  • Borgschulte, Andreas Empa Swiss Federal Laboratories for Materials Science and Technology, Dübendorf, Switzerland
  • Mauron, Philippe Empa Swiss Federal Laboratories for Materials Science and Technology, Dübendorf, Switzerland
  • Wallacher, Dirk Department Methods and Instruments, Helmholtz-Zentrum Berlin, Germany
  • Kemner, Ewout Department Methods and Instruments, Helmholtz-Zentrum Berlin, Germany
  • Russina, Margarita Department Methods and Instruments, Helmholtz-Zentrum Berlin, Germany
  • Pendolino, Flavio Empa Swiss Federal Laboratories for Materials Science and Technology, Dübendorf, Switzerland
  • Züttel, Andreas Empa Swiss Federal Laboratories for Materials Science and Technology, Dübendorf, Switzerland - Physics Department, University of Fribourg, Switzerland
Show more…
    31.08.2010
Published in:
  • The Journal of Physical Chemistry A. - 2010, vol. 114, no. 37, p. 10117–10121
English The hydrogen dynamics in solid and in liquid LiBH₄ was studied by means of incoherent quasielastic neutron scattering. Rotational jump diffusion of the BH₄⁻ subunits on the picosecond scale was observed in solid LiBH₄. The characteristic time constant is significantly shortened when the system transforms from the low-temperature phase to the high-temperature phase at 383 K. In the molten phase of LiBH₄ above 553 K, translational diffusion of the BH₄⁻ units is found. The measured diffusion coefficients are in the 10⁻⁵cm²/s range at temperatures around 700 K, which is in the same order of magnitude as the self-diffusion of liquid lithium or the diffusion of ions in molten alkali halides. The temperature dependence of the diffusion coefficient shows an Arrhenius behavior, with an activation energy of Ea = 88 meV and a prefactor of D₀ = 3.1 × 10⁻⁴cm²/s.
Faculty
Faculté des sciences
Department
Physique
Language
  • English
Classification
Physics
License
License undefined
Identifiers
Persistent URL
https://folia.unifr.ch/unifr/documents/301846
Statistics

Document views: 7 File downloads:
  • zut_bsl.pdf: 1