In: Zeitschrift für Physikalische Chemie, 2010, vol. 224, no. 1-2, p. 263-278
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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...
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In: Physical Review B: condensed matter and materials physics, 2011, vol. 83, no. 6, p. 064107
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In: The Journal of Physical Chemistry A, 2010, vol. 114, no. 37, p. 10117–10121
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...
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In: The Journal of Physical Chemistry C, 2010, vol. 114, no. 15, p. 7173-7177
We investigate the stability and hydrogen desorption of NaBH₄. Dynamic pcT (pressure, concentration, and temperature) measurements under constant hydrogen flows are used to determine thermodynamic parameters of reaction. From the van’t Hoff equation the enthalpy and entropy of reaction, −108 ± 3 kJ mol⁻¹ of H₂ and 133 ± 3 J K⁻¹ mol⁻¹ of H₂ released, are obtained,...
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