Origin of the large anharmonicity in the phonon modes of LiBH4

R. Gremaud, A. Züttel, A. Borgschulte, A. J. Ramirez-Cuesta, K. Refson, D. Colognesi

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

The dynamics and bonding of the complex hydride LiBH4 have been investigated by vibrational spectroscopy and density functional theory (DFT). The combination of infrared, Raman, and inelastic neutron-scattering (INS) spectroscopies on hydrided and deuterated samples reveals a complete picture of the dynamics of the BH4- ions as well as of the lattice. Particular emphasis is laid on a comparison between experiment and theory, revealing significant discrepancy between the two approaches for vibrations with high anharmonicity, which is related to large vibrational amplitudes. The latter is typical for librational modes in molecular crystals and pseudo-ionic crystals such as complex hydrides. The presented strategy for anharmonic frequency corrections might thus be generally applicable for this kind of materials.

Original languageEnglish
Pages (from-to)22-29
Number of pages8
JournalChemical Physics
Volume427
DOIs
StatePublished - Dec 12 2013

Funding

This work was financially supported by the Swiss federal office for Energy the CompHy and ACH projects and by the European Commission , Grant agreement No. FP7–284522 (infrastructure program H2FC). Computing resources provided by the UK e-Science Centre, STFC (SCARF) are gratefully acknowledged.

Keywords

  • Anharmonicity
  • Complex hydride
  • Density functional theory
  • Inelastic neutron scattering
  • Infrared spectroscopy
  • Raman spectroscopy

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