Investigation of amorphous states of SiO2 by Raman scattering spectroscopy

Effects of impurities on the lattice dynamics of nanocrystalline silicon for thermoelectric application

“…4, is attributed to an amorphous phase, and corresponds to the Boson peak usually observed in glasses [22]. This peak originates from the amorphous SiO 2 present in the sample and is in good agreement with the Boson peak position previously observed on amorphous SiO 2 with Raman scattering (51 cm -1 = 6.3 meV) [23] and with neutron scattering measurements (between 2 and 6 meV) [24].…”

Peculiarities of the oxyfluoride glasses' structure and crystallization

“…3) characterizes the middle region order (MRO) in a glass [22,23]. There is not a considerable change in the frequency of "boson" peak with variation of BiF 3 content in our glasses.…”

Nanostructures formed in pure quartz glass under irradiation in the reactor core

“…The authors explain it by one-photon photogeneration of charge carriers from the deep impurity levels to defects near the nanoparticle surface. It should be noted that the boson peak of Raman scattering observed in the glass with the ordered clusters (Malinovski et al, 2000) also testifies to a nonlinear optical response.…”

“…Being exposed to fast neutron fluencies 410 19 cm À 2 , the quartz lattice swells to 14 vol% and the SiO 2 glass network compacts to 3 vol% due to formation of the metamict phase with an intermediate density (Clinard and Hobbs, 1986). It was shown by Raman scattering spectroscopy that irradiation of KI-glass with fast neutron fluencies from 5 Á Â 10 17 to 2.2 Â 10 20 cm À 2 results in the density increase from 2.206 to 2.265 g/cm 3 , and the characteristic size of mesoscopic order decreases from 2.5 to 1.9 nm (Malinovski et al, 2000). The authors suggested the model of irradiated glass structure containing clusters ordered like cristobalite and tridymite and separated by amorphous layers.…”

“…Analysis of the available literature shows that there are few data of meso-scopic structure of network of the pure silicate glass (Clinard and Hobbs, 1986;Malinovski et al, 2000), which may contain SiO 2 nanocrystals formed under the bombardment with high energy particles. Then the point defects described above, may accumulate at effective sinks, such as the interfaces between amorphous, metamict and crystal phases of different densities (cristobalite, tridymite, quartz).…”