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

Published inJournal of alloys and compounds, vol. 363, no. 1-2, p. 129-132
Publication date2004
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 materials
  • Metal hydrides
  • Raman spectroscopy
Research group
Citation (ISO format)
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
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ISSN of the journal0925-8388
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