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Raman studies of reorientation motions of [BH4]- anions in alkali borohydrides

Published in Journal of alloys and compounds. 2004, vol. 363, no. 1-2, p. 129-132
Abstract Raman spectra of the alkali borohydride series MBH[4] (M=Li, Na, K, Rb, Cs) have been measured as a function of temperature in the range 300–540 K. For the cubic modification of M=Na, K, Rb and Cs, the analysis of the Raman line widths suggests that the energy barrier of reorientation of the [BH4]− anions decreases as a function of cation size in the sequence Na: 12.1(5), K: 9.2(4), Rb: 8.8(3) and Cs: 8.2(4) kJ/mol. For the hexagonal high temperature modification of LiBH[4], the data suggest two energy barriers of reorientation at ~ 5 and ~ 60 kJ/mol, respectively.
Keywords Hydrogen absorbing materialsMetal hydridesRaman spectroscopy
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Research group Groupe Hagemann
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HAGEMANN, Hans-Rudolf et al. Raman studies of reorientation motions of [BH4]- anions in alkali borohydrides. In: Journal of alloys and compounds, 2004, vol. 363, n° 1-2, p. 129-132. doi: 10.1016/S0925-8388(03)00468-7 https://archive-ouverte.unige.ch/unige:3514

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Deposited on : 2009-10-02

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