Structural and dynamic studies of Pr(11BH4)3

SR-XRD confirms volume contraction at the a-Pr ( 11 BH 4 ) 3 to r-Pr ( 11 BH 4 ) 3 phase transition.Vibrational spectra confirm that B eH bond length do not change at this phase transition.QENS experiments give the activation energy for BH4 reorientation.