Low-frequency band at 50 cm-1 in the Raman spectrum of cristobalite: identification of similar structural motifs in glasses and crystals of similar compositionстатьяИсследовательская статья
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 23 ноября 2017 г.
Аннотация:Raman spectra of high-temperature α-cristobalite ceramics and silica glass have been obtained in a wide frequency range from 10 to 1500 cm-1. A low-frequency maximum at 50 cm-1 in the spectrum of cristobalite has been observed to be similar to the well-known band at 52 cm-1 in the Raman spectra of silica glasses. The combination of literature reports on inelastic neutron scattering, low-temperature heat capacity, X-ray and neutron scattering in the region of the first sharp diffraction peak (FSDP) and our data on Raman and far IR spectroscopies indicate a cristobalite-like medium-range order in silica glasses. The comparison of the obtained spectra with the Raman spectrum of α-quartz, as well as the comparison of far IR spectra of some multicomponent glasses with the ones of corresponding crystals, demonstrates that by means of low-frequency spectroscopic data it is possible to identify the crystalline polymorphs reflected by the glass.