Motions in a viscous inorganic liquid: ferrous ion in cold phosphoric acid. [Diffusion line broadening in Moessbauer effect; glass--liquid transition]

Purpose of this work was to answer the questions: (a) are there rotational relaxation effects when diffusion becomes important above the glass transition temperature T/sub g/ and (b) can the intensity of Moessbauer absorption be understood in terms of glass and liquid dynamics. It is reported that rotational relaxation is not seen, and that there is a rapid increase in ''soft'' modes with temperature beginning at T/sub g/ seen both by Moessbauer technique and by Raman scattering.