The peculiarities of fluoride glass structure. Spectroscopic study

Glass systems based on ZrF4, InF3, GaF3 with added BiF3, SnF2, BaF2, SrF2, PbF2 were obtained to analyze changes of the structure and properties of these glasses with the addition of various components. The glass structures were investigated by means of vibration spectroscopy. IFS EQUINOX 55S, T64000 and DFS-24 spectrometers were used for measurements of infrared and Raman spectra. It was shown that BiF3 and SnF2 are the second glassformers as ZrF4, InF3 and GaF3. The structures of glassforming polyhedra were determined for each glass type. The structural peculiarities and the length scale of the medium range order were discussed and estimated by the frequency of the ‘boson’ peak in all low frequency Raman spectra of the glasses under study. The medium range order in InF3-BiF3-BaF2 glasses built from InF6 polyhedra that are not bound directly to BiFn polyhedra and Ba-modifier essentially determines the size of the medium range order of the glasses. Nanometer scale separation of mono-component fractions was not observed in glasses of the GaF3-SnF2 system.