Effect of pressure on the absolute Raman scattering cross section of SiO2 and GeO2 glasses

Cynthia H. Polsky, Kenneth H. Smith, George Wolf

Research output: Contribution to journalArticlepeer-review

88 Scopus citations


Quantitative measurements of the absolute Raman scattering intensity for the tetrahedral oxide glasses SiO2 and GeO2 show a dramatic decrease in the scattering cross section of the main symmetric stretching band in the pressure regions of 10-23 GPa for silica and 4-7 GPa for germania. This pressure region also corresponds to the pressure interval in which permanent structural changes occur for both glasses as observed in the Raman spectra of pressure-quenched samples when compressed in a hydrostatic medium. The noted relative enhancement of the D2 defect peak of the pressure-quenched samples of both silica and germania begins at 10 and 4 GPa and reaches saturation by 15 and 6.5 GPa, respectively. Decompression from higher peak pressures does not result in a significantly altered spectrum. These observations are in agreement with the formation of both five- and six-coordinated metal species via the formation of IIIO species during the four- to six-fold coordination change of the metal atom with increasing pressure.

Original languageEnglish (US)
Pages (from-to)159-168
Number of pages10
JournalJournal of Non-Crystalline Solids
Issue number2
StatePublished - Jun 2 1999

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Materials Chemistry


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