Elastic properties of permanently densified silica: A Raman, Brillouin light, and x-ray scattering study

M. Zanatta, G. Baldi, S. Caponi, A. Fontana, E. Gilioli, M. Krish, C. Masciovecchio, G. Monaco, L. Orsingher, F. Rossi, G. Ruocco, and R. Verbeni
Phys. Rev. B 81, 212201 – Published 17 June 2010

Abstract

Raman, Brillouin light, and x-ray scattering measurements have been carried out to characterize the low-frequency vibrational dynamics of the SiO2 glass as function of its density. The obtained results demonstrate that while the distribution of the low-frequency states in the boson peak range is conserved under densification, these modes do not shift as a function of density as the acoustic modes do. The clear difference between the behavior of the vibrational states in the Boson peak range and that of the acoustic modes, could be explained considering the contribution of specific nonacoustic modes (tetrahedra rotation).

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  • Received 22 March 2010

DOI:https://doi.org/10.1103/PhysRevB.81.212201

©2010 American Physical Society

Authors & Affiliations

M. Zanatta1, G. Baldi2,3, S. Caponi1,2, A. Fontana1,2, E. Gilioli4, M. Krish3, C. Masciovecchio2,5, G. Monaco2,3, L. Orsingher3, F. Rossi1,2, G. Ruocco2,6, and R. Verbeni3

  • 1Dipartimento di Fisica, Università di Trento, 38050 Povo, Trento, Italy
  • 2IPCF-CNR Unità Organizzativa di Supporto c/o Università di Roma “La Sapienza,” 00185 Roma, Italy
  • 3European Synchrotron Radiation Facility, BP 220, 38043 Grenoble, France
  • 4Istituto dei Materiali per Elettronica e Magnetismo (IMEM), CNR, Area delle Scienze, 43100 Parma, Italy
  • 5Sincrotrone di Trieste, Strada Statale 14 km 163.5, 34012 Basovizza, Trieste, Italy
  • 6Dipartimento di Fisica, Università di Roma “La Sapienza,” 00185 Roma, Italy

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Issue

Vol. 81, Iss. 21 — 1 June 2010

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