Rotational motion of BH{sub 4} units in MBH{sub 4} (M=Li,Na,K) from quasielastic neutron scattering and density functional calculations

We present a combined experimental and theoretical study on the rotational motion of the (BH{sub 4}){sup -} ions in alkaline tetrahydroborides MBH{sub 4}, M=(Li,Na,K). The BH{sub 4} motions are thermally activated and characterized by activation energies in the order of 0.1 eV, typical frequencies a...

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