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Université de Fribourg

Rotational motion in LiBH₄/LiI solid solutions

Martelli, Pascal ; Remhof, Arndt ; Borgschulte, Andreas ; Ackermann, Ralf ; Strassle, Thierry ; Embs, Jan Peter ; Ernst, Matthias ; Matsuo, Motoaki ; Orimo, Shin-Ichi ; Züttel, Andreas

In: The Journal of Physical Chemistry A, 2011, vol. 115, no. 21, p. 5329–5334

We investigated the localized rotational diffusion of the (BH₄)⁻ anions in LiBH₄/LiI solid solutions by means of quasielastic and inelastic neutron scattering. The (BH₄)⁻ motions are thermally activated and characterized by activation energies in the order of 40 meV. Typical dwell times between jumps are in the picosecond range at temperatures of about 200 K. The motion is dominated by...