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

Bosak, Alexeï
Refson, Keith
Mirone, Alessandro
Chumakov, Aleksandr
Krisch, Michael
Published in Journal of Physics. Condensed Matter. 2015, vol. 27, no. 30, p. 305401
Abstract 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.
Keywords Lattice dynamics. cristobaliteBoson peakPhonon dispersionInelstic x-ray scatteringThermal diffuse scatteringAb initio lattice dynamics
arXiv: 1501.01196
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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 https://archive-ouverte.unige.ch/unige:48349

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Deposited on : 2015-03-18

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