Rotational motion in LiBH₄/LiI solid solutions
-
Martelli, Pascal
Empa Swiss Federal Laboratories for Materials Science and Technology, Hydrogen & Energy, Dubendorf, Switzerland - Physics Department, University of Fribourg, Switzerland
-
Remhof, Arndt
Empa Swiss Federal Laboratories for Materials Science and Technology, Hydrogen & Energy, Dubendorf, Switzerland
-
Borgschulte, Andreas
Empa Swiss Federal Laboratories for Materials Science and Technology, Hydrogen & Energy, Dubendorf, Switzerland
-
Ackermann, Ralf
Laboratory for Neutron Scattering, Paul Scherrer Institut, Villigen PSI, Switzerland
-
Strassle, Thierry
Laboratory for Neutron Scattering, Paul Scherrer Institut, Villigen PSI, Switzerland
-
Embs, Jan Peter
Laboratory for Neutron Scattering, Paul Scherrer Institut, Villigen PSI, Switzerland
-
Ernst, Matthias
Inorganic Chemistry, ETH Zurich, 8093 Zurich, Switzerland
-
Matsuo, Motoaki
Institute for Materials Research, Tohoku University, Sendai, Japan
-
Orimo, Shin-Ichi
Institute for Materials Research, Tohoku University, Sendai, Japan
-
Züttel, Andreas
Empa Swiss Federal Laboratories for Materials Science and Technology, Hydrogen & Energy, Dubendorf, Switzerland - Physics Department, University of Fribourg, Switzerland
Show more…
Published in:
- The Journal of Physical Chemistry A. - 2011, vol. 115, no. 21, p. 5329–5334
English
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 90° reorientations around the 4-fold symmetry axis of the tetrahedraly shaped (BH₄)⁻ ions. As compared to the pure system, the presence of iodide markedly reduces activation energies and increases the rotational frequencies by more than a factor of 100. The addition of iodide lowers the transition temperature, stabilizing the disordered high temperature phase well below room temperature.
-
Faculty
- Faculté des sciences et de médecine
-
Department
- Département de Physique
-
Language
-
-
Classification
-
Physics
-
License
-
License undefined
-
Identifiers
-
-
Persistent URL
-
https://folia.unifr.ch/unifr/documents/302124
Statistics
Document views: 36
File downloads: