Vibrational spectra and structure of ZrF4-FeF3-PbF2-YF3 fluoride glasses

Abstract

Results of the investigation of infrared and Raman spectra in heavy metal fluoride glasses based on the ZrF4-FeF3-PbF2-YF3 system are presented. Infrared and Raman bands in the spectra of these glasses are discussed. The coordination environments of both Zr4+ and Fe3+ ions have been extracted from the vibrational modes. A structural model for these glasses is proposed. It is composed of the basic network formers ZrF7 polyhedra and FeF6 octahedra, which are randomly linked by corners and/or edges to construct a disordered three-dimensional network, whereas the Pb2+ and Y3+ ions are assumed to play the role of network modifier and stabilizer, respectively.