Scientific article
Open access

Lattice dynamics of α-cristobalite and the Boson peak in silica glass

Published inJournal of physics. Condensed matter, vol. 27, no. 30, 305401
Publication date2015

The lattice dynamics of the silica polymorph {alpha}-cristobalite has been investigated by a combination of diffuse and inelastic x-ray scattering and ab initio lattice dynamics calculations. Phonon dispersion relations and vibrational density of states are reported and the phonon eigenvectors analysed by a detailed comparison of scattering intensities. The experimentally validated calculation is used to identify the vibration contributing most to the first peak in the density of vibrational states. The comparison of its displacement pattern to the silica polymorphs {alpha}-quartz and coesite and to vitreous silica reveals a distinct similarity and allows for decisive conclusions on the vibrations causing the so-called Boson peak in silica glass.

  • Lattice dynamics. cristobalite
  • Boson peak
  • Phonon dispersion
  • Inelstic x-ray scattering
  • Thermal diffuse scattering
  • Ab initio lattice dynamics
  • arxiv : cond-mat.mtrl-sci
Citation (ISO format)
WEHINGER, Björn et al. Lattice dynamics of α-cristobalite and the Boson peak in silica glass. In: Journal of physics. Condensed matter, 2015, vol. 27, n° 30, p. 305401. doi: 10.1088/0953-8984/27/30/305401
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Article (Submitted version)
ISSN of the journal0953-8984

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Creation03/17/2015 3:18:00 PM
First validation03/17/2015 3:18:00 PM
Update time03/14/2023 11:03:01 PM
Status update03/14/2023 11:03:00 PM
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