Abstract
Abstract The reorientational dynamics of tetrahydroborate (BH 4 − ) anions in a variety of environments were probed as a function of temperature via fixed-window scans (FWSs) at zero energy transfer using a neutron backscattering spectrometer. The temperature dependence of the FWS was shown to be a sensitive indicator of the relative reorientational mobilities of BH 4 − anions in the various alkali-metal borohydride compounds MBH 4 (M = Li, Na, K, Rb, Cs), LiBH 4 nanoconfined in carbon aerogel, and LiBH 4 –LiI solid solution.
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