Structural relaxation of SiO2 at elevated temperatures monitored by in situ Raman scattering

Sintering process of amorphous SiO2 nanoparticles investigated by AFM, IR and Raman techniques

“…In order to make possible a quantitative analysis of the spectra they were normalized to the band at 800 cm −1 . This band is assigned to the symmetric stretching of the Si-O-Si groups and it is characterized by the fact that its amplitude and shape hardly change with thermal treatment [16,17]. The data reported in Fig.…”

Fabrication, characterization, cathodoluminescence, and field-emission properties of silica (SiO2) nanostructures

“…2(b) displays the room-temperature Raman spectrum of the bundle of SiO 2 nanostructures which exhibits a broad peak at around 411 cm −1 and a steam-like peak at 700 cm − 1 . Previously, Yu et al [10] reported that the Raman spectrum of amorphous silica nanowires has two broad peaks located at approximately 450 cm −1 and 790 cm − 1 , respectively; Goller et al [13] found that the SiO 2 Raman spectrum of amorphous silica powders contains three peaks at 450 cm −1 , 480 cm −1 and 800 cm −1 ; Li et al [14] reported two steam-like peaks located at 430 cm −1 and at 790 cm −1 , respectively, from the nano-SiO 2 wires. Compared with the above literature, in our experiment, there is some shift in the peak location, which may be due to the size-confinement effect and internal lattice strain induced by the defects.…”

Raman measurements in silica glasses irradiated with energetic ions

“…We will focus on its area as a spectral parameter suitable to characterize the ionic irradiation effects. To analyze the spectra a Levenberg-Marquardt computational fitting routine was applied in order to minimize the difference between experimental Raman spectrum and a model spectrum given by the sum of three Lorentzian functions within the 440-700 cm -1 interval, two bands D 1 and D 2 , and also an extra Lorentzian band to account the influence of the broad asymmetric R band [27]. Lorentzian bands areas, centers and full width at half maximum (FWHM) were the fitting parameters.…”