VIBRATIONAL-SPECTRA AND STRUCTURE OF FLUOROINDATE GLASSES

A series of fluoroindate glasses, both binary (xInF3.[1-x]MF2, M = Sr, Ba) and multicomponent (InF3-ZnF2-SrF2-BaF2-CdF2), have been prepared and their infrared absorption and reflection spectra were measured. P olarized Raman spectra were also recorded for all the different glass compositions. Starting with the binary compositions, some structural c onclusions were derived for these fluoroindate glasses, whose structur e is still virtually unknown. The In atoms appear to be always in octa hedral coordination, as inferred from both the infrared and Raman spec tra, the latter being dominated by a highly polarized high frequency m ode at approximately 509 cm-1, in a fashion similar to fluorozirconate glasses. Other features in the vibrational spectra provided additiona l insight into the structural environments of the glass cations, namel y, Zn.