Vibrational spectra and structure of chloro-fluorozirconate glasses

Abstract

A series of barium chloro-fluorozirconate glasses have been prepared. Their IR absorption, IR reflectivity and Raman spectra have been measured down to 33 cm −1. The glass transition and crystallization temperatures have also been measured. The high frequency IR absorption and Raman modes of the chloro-fluorozirconate glasses have been assigned as in fluorozirconate glasses. The IR reflection spectra of chloride-containing glasses differed from the fluorozirconates in that one band was clearly related to Cl atom motions. The structure of the glasses probably consists of zig-zag chains of ZrCl 2F 4 mixed halide octahedra plus a pure fluoride matrix whose structure is similar to that of a ZrF 4BaF 2 glass with the same composition.