The peculiarities of fluoride glass structure. Spectroscopic study

Abstract Glass systems based on ZrF 4 , InF 3 , GaF 3 with added BiF 3 , SnF 2 , BaF 2 , SrF 2 , PbF 2 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 BiF 3 and SnF 2 are the second glassformers as ZrF 4 , InF 3 and GaF 3 . 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 InF 3 -BiF 3 -BaF 2 glasses built from InF 6 polyhedra that are not bound directly to BiF n 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 GaF 3 -SnF 2 system.