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English

Lithium boro-hydride LiBH4 II. Raman spectroscopy

Published inJournal of alloys and compounds, vol. 346, no. 23, p. 206-210
Publication date2002
Abstract

Polycrystalline LiBH4 has been studied by Raman spectroscopy in the temperature interval 295–412 K and the frequency range 2700–130 cm−1. The Raman active modes are consistent with the presence of a (BH4)− ion having a distorted tetrahedral configuration. As the temperature is increased the sudden disappearance of mode splitting points to the onset of a structural phase transition that leads to a higher local symmetry of the (BH4)− tetrahedron. The transition occurs at 384 K, is of first-order and has a hysteresis of about 8 K. A strong and discontinuous broadening of bands remaining after the transition suggests the onset of large vibrational amplitudes of the (BH4)− tetrahedra about their trigonal axis.

Keywords
  • Hydrogen storage materials
  • Metal hydrides
  • Crystal structure
  • Raman spectroscopy
  • Phase transition
Research group
Citation (ISO format)
GOMES, Sandrine, HAGEMANN, Hans-Rudolf, YVON, Klaus. Lithium boro-hydride LiBH4 II. Raman spectroscopy. In: Journal of alloys and compounds, 2002, vol. 346, n° 23, p. 206–210. doi: 10.1016/S0925-8388(02)00668-0
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ISSN of the journal0925-8388
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