Abstract
Phonon linewidths and frequencies of the mixed crystals ${\mathrm{KBr}}_{1\mathrm{\ensuremath{-}}\mathrm{x}}$(CN${)}_{\mathrm{x}}$, 0.00lxl0.57, are presented as a function of temperature for the ${T}_{2g}$ symmetry mode and an off-symmetry mode in backscattering geometry using Brillouin spectroscopy. At the higher concentrations a ``glass'' transition can be observed: The scattering intensity and phonon linewidth increase sharply at the transition and the phonon frequency goes through a minimum. The increase in scattering intensity near the transition temperature is allied to the decreasing phonon frequency, but the changes in linewidth and frequency cannot be completely understood at the present time.
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